Accounts receivable, net
Accretion of discount
Accumulated other comprehensive income
Total Accumulated Depreciation, Depletion and Amortization
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Additional paid-in capital
Cash capital expenditures
Amortization of debt issuance costs and discounts
Distributions from unconsolidated affiliates and other
Unrealized (gain) loss on basis-only swaps
Unrealized Gain (Loss) on Derivatives
Allowance for Doubtful Accounts [Member]
Allowance for bad debts [Member]
Amount that will be settled and reclassified from AOCI to the Consolidated Statements of Income during the next twelve months
Restricted Stock [Member]
Stock Options [Member]
Impairment of long-lived assets
Asset Impairment Charges [Abstract]
ARO liability at beginning of period
ARO liability at end of period
Asset Retirement Obligation
Asset Retirement Obligations [Abstract]
Asset Retirement Obligations
Asset Retirement Obligation Disclosure [Text Block]
Accretion
Asset Retirement Obligation, Accretion Expense
Liabilities incurred
Liabilities settled
Asset Retirement Obligation, Liabilities Settled
Asset retirement obligations [Roll Forward]
Asset retirement obligations
Asset Retirement Obligations
Asset Retirement Obligations, Policy [Policy Text Block]
Environmental Contingencies
CONSOLIDATED BALANCE SHEETS [Abstract]
Checks outstanding in excess of cash balances
Bank Overdrafts
Basic total (in dollars per share)
Basic EPS attributable to QEP
Pension Plans, Other Postretirement Benefits and Defined-Contribution Plans
Building [Member]
Buildings [Member]
Accumulated depreciation, depletion and amortization
Capitalized Costs, Accumulated Depreciation, Depletion, Amortization and Valuation Allowance Relating to Oil and Gas Producing Activities
Proved properties
Unproved properties
Net Property, Plant and Equipment
Net capitalized costs
Total Property, Plant and Equipment
Proved properties (Capitalized costs, gross)
Cash and cash equivalents
Beginning cash and cash equivalents
Ending cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value
Cash and Cash Equivalents
Interest
Accounts payable and accrued expenses
Increase (Decrease) in Accounts Payable and Accrued Liabilities
Accounts receivable
Increase (Decrease) in Accounts Receivable
Inventories
Increase (Decrease) in Inventories
Prepaid expenses
Increase (Decrease) in Prepaid Expense
Changes in operating assets and liabilities
Increase (Decrease) in Operating Capital [Abstract]
Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Common stock, shares authorized (in shares)
Common stock, shares issued (in shares)
Common Stock, Shares, Issued
Common stock - par value $0.01 per share; 500.0 million shares authorized; 177.2 million and 175.9 million shares issued at December 31, 2011 and 2010, respectively
Components of Deferred Taxes [Abstract]
Components of Income Tax Expense [Abstract]
Federal
Federal Income Tax Expense (Benefit), Continuing Operations [Abstract]
State
State and Local Income Tax Expense (Benefit), Continuing Operations [Abstract]
Comprehensive income attributable to QEP
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Equity contribution
Investment Grade Long-Term Debt [Member]
Gathering, processing and other
Gathering, processing and other
Purchased gas and oil expense
Natural gas, oil and NGL transportation and other handling costs
Natural gas, oil and NGL transportation and other handling costs
Total costs incurred
Costs Incurred, Acquisition of Oil and Gas Properties
Proved
Unproved
ARO expenses included in development costs
Development
Exploration (capitalized and expensed)
Current
Current Federal Tax Expense (Benefit)
Total Current Liabilities
Liabilities, Current
Current Liabilities
Current
Debt
Debt Disclosure [Text Block]
Total principal amount of debt
Stated interest rate (in hundredths)
Maturity date
Less unamortized discount
Provisions to increase and extend credit facility
Debt Instrument [Line Items]
Schedule of Long-term Debt Instruments [Table]
Long-term debt issuance costs paid
Payments of Debt Issuance Costs
Debt Securities [Member]
Deferred
Deferred Federal Income Tax Expense (Benefit)
Deferred income taxes
Deferred income taxes
Deferred tax assets (liabilities)
Deferred Tax Liabilities, Current
Deferred
Energy-price derivatives
Total deferred tax assets
Deferred Tax Assets, Gross
NOL and tax credit carryforwards
Deferred Tax Assets, Operating Loss Carryforwards
Other
Deferred Tax Assets, Other
U.S. alternative minimum tax credit
Employee benefits and compensation costs
Deferred income taxes
Total deferred tax liabilities
Deferred Tax Liabilities, Noncurrent
Defined Benefit Plans and Other Postretirement Benefit Plans [Domain]
Employee Investment Plan
Defined contribution plan expense
Depreciation, depletion and amortization
Depreciation, depletion and amortization
Depreciation, Depletion and Amortization, Nonproduction
Depreciation, depletion and amortization
Depreciation, Depletion and Amortization [Abstract]
Derivative - contract term
Fair value of derivative assets, gross
Fair value of derivative liabilities, gross
Unrealized Gain (Loss) on Derivatives
Derivative, Gain (Loss) on Derivative, Net
Derivative, Index
Derivative contracts - short term
Total assets
Derivative contracts - long term
Derivative Assets, Noncurrent
Fair value of derivative contracts
Derivative Instruments and Hedges, Assets
Fair value of derivative contracts
Derivative Instruments and Hedges, Noncurrent
Derivative Contracts
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Unrealized gain on basis-only swaps
Unrealized and realized loss on basis-only swaps
Realized loss on basis-only swaps
Derivative contracts - short term
Derivative Liabilities, Current
Fair value of derivative contracts
Derivative contracts - long term
Derivative Instruments
Derivatives, Policy [Policy Text Block]
Plan description
Diluted total (in dollars per share)
Diluted EPS attributable to QEP
Discontinued Operations
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]
SEC's Modernization of Oil and Gas Reporting Requirements
Industry Specific Policies, Oil and Gas [Policy Text Block]
Principles of Consolidation
Consolidation, Policy [Policy Text Block]
Disposal Groups, Including Discontinued Operations, Name [Domain]
Revenues
Disposal Group, Including Discontinued Operation, Revenue
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Axis]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income Statement Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table]
10% annual discount for estimated timing of net cash flows
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, 10 Percent Annual Discount for Estimated Timing of Cash Flows
Future cash inflows
Future development costs
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Development Costs
Future income tax expenses
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Income Tax Expense
Future net cash flows
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Net Cash Flows
Future production costs
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Production Costs
Standardized measure of discounted future net cash flows
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Standardized Measure
Distribution from Questar
Payments of Distributions to Affiliates
Income from unconsolidated affiliates
Income from unconsolidated affiliates
Effective income tax rate (in hundredths)
Effective Income Tax Rate, Continuing Operations
Effective Income Tax Rate Reconciliation [Abstract]
Federal income taxes statutory rate (in hundredths)
Non-deductible Spin-off costs (in hundredths)
Other (in hundredths)
State income taxes, net of federal income tax benefit (in hundredths)
Share-based compensation expense
Tax benefit from share-based compensation expense
Share-based compensation
Share-Based Compensation [Abstract]
Gas, oil and NGL
Equipment [Member]
Service, transportation and field service equipment [Member]
Investment in unconsolidated affiliates
Equity Method Investee, Name [Domain]
Ownership percentage (in hundredths)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Schedule of Error Corrections and Prior Period Adjustment Restatement [Table]
Abandonment and impairment
Abandonment and impairment
Exploration Abandonment and Impairment Expense
Exploration expenses
Exploration Expense
Net change due to extensions and discoveries
Principal amount senior notes purchased
Furniture and Fixtures [Member]
Furniture and office equipment [Member]
Net gain from asset sales
Gain (Loss) on Disposition of Assets
Net gain from asset sales
Net gain (loss) from asset sales
Loss from early extinguishment of debt
Loss on early extinguishment of debt
Loss on early extinguishment of debt
Gathering, processing and other
Gas Gathering, Transportation, Marketing and Processing Revenue
General and administrative
Description of plans
Goodwill and Other Intangible Assets
Impairment of Long-Lived Assets
CONSOLIDATED STATEMENTS OF INCOME [Abstract]
Diluted from continuing operations (in dollars per share)
Diluted EPS from continuing operations
Basic from continuing operations (in dollars per share)
Basic EPS from continuing operations
Discontinued operations, net of income tax
Discontinued operations, net of income tax
Discontinued operations, net of income taxes
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest
Diluted from discontinued operations (in dollars per share)
Basic from discontinued operations (in dollars per share)
Income before income taxes
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax
Income Taxes
Income tax returns under examination
Income Tax Examination [Line Items]
Income Tax Examination [Table]
Total income tax expense
Income Tax Expense (Benefit), Continuing Operations
Income taxes
Tax on equity adjustment
Income Tax Effects Allocated Directly to Equity
Income Taxes
Income Tax Disclosure [Text Block]
Income Taxes
Income Tax, Policy [Policy Text Block]
Changes in future development costs
Net changes in income taxes
Potential number of shares issuable under the Long-term Stock Incentive Plan (in shares)
Goodwill
Interest expense
Interest Expense
Interest Income [Member]
Interest and Other Income [Member]
Interest and other income (loss)
Interest and other income
Interest Income, Operating
Inventories, at lower of average cost or market
Investment in Unconsolidated Affiliates
Equity Method Investments, Policy [Policy Text Block]
Investment in unconsolidated affiliates
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
Lease operating expense
Lease operating expense
Rental expense
Leasehold Improvements [Member]
TOTAL LIABILITIES AND EQUITY
Liabilities and Equity
LIABILITIES AND EQUITY
Credit facility outstanding balance
Weighted-average interest rate on credit facility borrowings (in hundredths)
New credit facility, maximum borrowing capacity
Line of Credit [Member]
Revolving Credit Facility [Member]
Current portion of long-term debt
Long-term debt, less current portion
Total long-term debt outstanding
Noncontrolling interest
Distribution of noncontrolling interest
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders
Net Cash Provided by Operating Activities of Continuing Operations
Net Cash Provided by (Used in) Operating Activities, Continuing Operations
Effect of change in cash and cash equivalents of discontinued operations
Net Cash Provided by (Used in) Discontinued Operations
FINANCING ACTIVITIES
INVESTING ACTIVITIES
OPERATING ACTIVITIES
Checks outstanding in excess of cash balances
NET INCOME ATTRIBUTABLE TO QEP
NET INCOME ATTRIBUTABLE TO QEP
Net income (loss) attributable to QEP
Change in cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Net changes in prices and production costs related to future production
Net change
Standardized Measure of Discounted Future Net Cash Flow of Proved Oil and Gas Reserves, Period Increase (Decrease)
Dry exploratory well expense
Separation costs
Average price per unit used to calculate proved reserves ($ per Mcf/Bbl)
Capitalized exploratory well costs
Exploratory Drilling Costs Capitalization and Impairment, Policy [Policy Text Block]
Imbalance obligations
Impairment of long-lived assets
Exploration and production
Total Revenues
Revenues
Oil and Gas Revenue
Reserve Quantities [Line Items]
Proved Developed and Undeveloped Oil and Gas Reserve Quantities [Table]
Extensions and discoveries (2)
Proved and unproved leaseholds
Proved Developed and Undeveloped Reserves, Net
Production
Purchase of reserves in place
Revisions of previous estimates (1)
Sale of reserves in place
Reserves, Unit of Measure
Minimum Future Payments of Long-term Operating Leases [Abstract]
2012
Operating Leases, Future Minimum Payments Due, Current
2016
Operating Leases, Future Minimum Payments, Due in Five Years
2015
Operating Leases, Future Minimum Payments, Due in Four Years
2014
Operating Leases, Future Minimum Payments, Due in Three Years
2013
Operating Leases, Future Minimum Payments, Due in Two Years
After 2016
Net operating loss carryforwards
Operating Loss Carryforwards
Net operating loss carryforwards
Operating Loss Carryforwards, Expiration Dates
OPERATING INCOME
Operating income
REVENUES
Other
Increase (Decrease) in Other Operating Assets and Liabilities, Net
Total amount recognized in other comprehensive income
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax
Total pension and other postretirement plans adjustments
Change in pension and postretirement liability, net of tax
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax
Pension and other postretirement plans adjustments:
Net unamortized gain (loss) incurred
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized (Gain) Loss Arising During Period, Net of Tax
Tax expense (benefit) on net unamortized gain (loss) incurred
Other comprehensive income
Other Comprehensive Income (Loss), Net of Tax
Prior service cost incurred
Recognized prior service cost
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Net of Tax
Other comprehensive income (loss), tax
Gains (losses) on changes in unrealized fair value of derivatives designated as cash flow hedges
Change in unrealized fair value of derivatives, net of tax
Other Postretirement Benefit Plans, Defined Benefit [Member]
Other Postretirement Benefits [Member]
Term loan agreement, amount
Dividends paid
Payments of Dividends, Common Stock
Employee Benefits
Pension and Other Postretirement Benefits Disclosure [Text Block]
Pension Plans, Defined Benefit [Member]
Pension Benefits [Member]
Accumulated benefit obligation
Actual gain (loss) on plan assets
Unrealized gains and losses
Actuarial loss (gain)
2017 through 2021
Amortization of net actuarial losses
Amortization of prior service costs
Amortization of prior service cost recognition
Total amount recognized in balance sheet
Amounts recognized in accumulated other comprehensive income (AOCI)
Amounts recognized in balance sheets
Reclassifications from AOCI in next fiscal year [Abstract]
Assumed health care cost trend rates [Abstract]
Benefit payments
Benefits paid
Transfer due to Spin-off
Transfer due to Spin-off
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation
Transfer due to Spin-off
Change in benefit obligation
Change in plan assets
Components of net periodic benefit cost
Pension contributions
Company contributions to the plan
Employer contributions
Accounts payable and accrued expenses
Discount rate
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate
Effect of one-percentage point change in assumed health care cost trend rate [Abstract]
Effect of one percentage point decrease in the health-care inflation rate on accumulated postretirement benefit obligation
Effect of one percentage point decrease in the health-care inflation rate on service and interest costs
Effect of one percentage point increase in the health-care inflation rate on accumulated postretirement benefit obligation
Effect of one percentage point increase in the health-care inflation rate on service and interest costs
Expected Benefit Payments
Expected contributions in next fiscal year
2012
2013
2014
2015
2016
Expected return on plan assets
Defined Benefit Plan, Expected Return on Plan Assets
Fair value of plan assets at January 1,
Fair value of plan assets at December 31,
Fair value of plan assets
Defined Benefit Plan, Fair Value of Plan Assets
Underfunded status (current and long-term)
Health care cost trend rate
Plan Assets
Interest cost
Net actuarial loss (gain)
Net periodic benefit cost
Defined Benefit Plan, Net Periodic Benefit Cost
Change in plan assumptions
Prior service cost
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax
Rate of increase in compensation
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase
Service cost
Ultimate health care cost trend rate
Fair Value of Plan Assets [Abstract]
Assumptions for benefit obligations
Assumptions for benefit costs
Year rate reaches ultimate trend rate
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Axis]
Benefit obligation at January 1,
Benefit obligation at December 31,
Defined Benefit Plan, Benefit Obligation
Previously estimated development costs incurred during the period
Other capital contributions
Long-term debt issued
Proceeds from disposition of assets
Property, Plant and Equipment
Proved properties
Proved Oil and Gas Property, Successful Effort Method
Bad debt expense associated with accounts receivable
Other investments
Payments to Acquire Equity Method Investments
Property, plant and equipment, including dry exploratory well expense
Payments to Acquire Oil and Gas Equipment
Property acquisitions
Payments to Acquire Oil and Gas Property
Materials and supplies
Notes Receivable from or Payable to Questar Corporation
Credit Risk
Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy
Distribution from Questar and other
Long-term debt repaid
Repayments of Long-term Debt
Repayments of notes payable
Repayments of Notes Payable
Current portion long-term debt repaid
Repayments of Senior Debt
Distribution to noncontrolling interest
Payments to Noncontrolling Interests
Depreciation, depletion and amortization
Exploration expenses
Abandonment and impairment
Income before income taxes
Income taxes
Results of Operations, Income Tax Expense
Results of operations from producing activities excluding allocated corporate overhead and interest expenses
Results of Operations, Oil and Gas Producing Activities Net Income (Excluding Corporate Overhead and Interest Costs)
Production costs
Revenues
Results of Operations, Revenue from Oil and Gas Producing Activities
Retained earnings
Revenue Recognition
Revenue Recognition, Policy [Policy Text Block]
Natural gas sales
Purchased gas and oil sales
Net change due to revisions of quantity estimates
NGL sales
Oil sales
Sales of gas, oil and NGL produced during the period, net of production costs
Capitalized Costs
Costs Incurred
Cost Incurred in Oil and Gas Property Acquisition, Exploration, and Development Activities Disclosure [Table Text Block]
Changes in Benefit Obligation and Fair Value of Plan Assets
Discontinued operations
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Estimated Useful Lives
Estimated Quantities of Proved Gas and Oil Reserves
Results of Operations
Results of Operations for Oil and Gas Producing Activities Disclosure [Table Text Block]
Standardized Measure of Future Net Cash Flows Relating to Proved Reserves
Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves Disclosure [Table Text Block]
Schedule of Valuation and Qualifying Accounts
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Operations By Line Of Business
Segment Reporting Disclosure [Text Block]
Operations by line of business
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment [Table]
Forfeited (in shares)
Weighted-Average Price, Forfeited (in dollars per share)
Granted (in shares)
Weighted-Average Price, Granted (in dollars per share)
Number of shares of restricted stock held by employees and non-employee directors (in shares)
Balance, beginning (in shares)
Balance, Ending (in shares)
Weighted-Average Price, beginning balance (in dollars per share)
Weighted-Average Price, Ending Balance (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Vested (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period
Number Exercisable (in shares)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain]
Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Axis]
Number Outstanding (in shares)
Exercise price range, upper range limit ( in dollars per share)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation, Shares Authorized under Stock Option Plans [Line Items]
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table]
Number of shares available for future grants (in shares)
Intrinsic value of options exercised
Weighted-Average Price, Exercised (in dollars per share)
Forfeited (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period
Weighted-Average Price, Forfeited (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price
Granted (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures
Weighted-Average Price, Granted (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price
Fair value of options at grant date (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Aggregate Intrinsic Value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value
Number of stock options held by employees and non-employee directors (in shares)
Balance, beginning (in shares)
Balance, Ending (in shares)
Weighted-Average Price, beginning (in dollars per share)
Weighted-Average Price, Ending (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Share-based payment award terms
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis]
Share-based Compensation Arrangements by Share-based Payment Award, Award Type and Plan Name [Domain]
Stock Options Outstanding, by exercise price range
Transportation and other handling costs
Term of term loan agreement (in days)
Summary of Significant Accounting Policies
Significant Accounting Policies [Text Block]
State and Local Jurisdiction [Member]
CONSOLIDATED STATEMENTS OF CASH FLOWS [Abstract]
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
CONSOLIDATED STATEMENTS OF EQUITY [Abstract]
Share-Based Compensation
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]
EQUITY
Transfer Wexpro to Questar
Stockholders' Equity, Change in Reporting Entity
Derivative Contracts - Volumes and Prices
Effect of derivative instruments designated as cash flow hedges [Abstract]
Open tax years
Supplemental Disclosure of Cash Paid (Received) During the Year for:
Swap [Member]
U.S. alternative minimum tax credit
Tax Credit Carryforward, Expiration Dates
Income taxes
Income Taxes Paid
Total Current Assets
Assets, Current
Current Assets
Treasury Stock [Member]
Future Contractual Obligations
Unproved properties, not being depleted
Unrecognized tax benefits - beginning of year
Unrecognized tax benefits - end of year
Unrecognized Tax Benefits
2016
Unrecorded Unconditional Purchase Obligation, Due within Five Years
2015
Unrecorded Unconditional Purchase Obligation, Due within Four Years
2013
Unrecorded Unconditional Purchase Obligation, Due within Two Years
2014
Unrecorded Unconditional Purchase Obligation, Due within Three Years
2012
Unrecorded Unconditional Purchase Obligation, Due within One Year
Beginning Balance
Ending Balance
Valuation Allowances and Reserves, Balance
Amounts charged to expense
Deductions for accounts written off and other
Valuation Allowances and Reserves [Domain]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves Type [Axis]
Valuation and Qualifying Accounts Disclosure [Table]
Used in diluted calculation
Average diluted common shares outstanding (in shares)
Used in basic calculation
Weighted-average basic common shares outstanding (in shares)
Common Stock [Member]
Property, Plant and Equipment, Type [Domain]
Estimated useful lives, maximum
Estimated useful lives, minimum
Property, Plant and Equipment, Useful Life, Minimum
Property, Plant and Equipment (successful efforts method for gas and oil properties)
Energy-price derivatives
Deferred Tax Liabilities, Derivatives
Investment Grade Intermediate Term Debt [Member]
TOTAL ASSETS
Identifiable assets
Allowance for bad-debt expenses
Other long-term liabilities
Other Liabilities, Noncurrent
Dividends paid
Dividends
Costs Incurred
Costs Incurred, Acquisition of Oil and Gas Properties [Abstract]
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Net Cash Flows [Abstract]
Standardized Measure of Future Net Cash Flows Relating to Proved Reserves
Results of Operations
Capitalized Costs
Capitalized Costs, Oil and Gas Producing Activities, Net [Abstract]
Income Tax Authority [Domain]
Share-Based Compensation
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Minimum Future Payments of Long-term Operating Leases
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis]
Fair Value, Disclosure Item Amounts [Domain]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents
Scenario, Unspecified [Domain]
Statement [Table]
Statement, Scenario [Axis]
Carrying amount and estimated fair value of other financial assets
Carrying amount and estimated fair value of other financial liabilities
Valuation and qualifying accounts [Roll Forward]
ASSETS
Statement [Line Items]
Supplemental Gas and Oil Information (Unaudited)
Oil and Gas Exploration and Production Industries Disclosures [Text Block]
Proved reserves
Change in Fair Value of Level 3 Assets and Liabilities
Beginning Balance
Ending Balance
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value
Change in Level 3 Fair Value Measurements [Roll Forward]
Changes in fair value of Level 3 Investments
Discount rate
Expected long-term return on plan assets
Rate of increase in compensation
Amounts and Expiration Dates of Operating Loss and Tax Credit Carryforwards
Fair Value, Inputs, Level 1 [Member]
Level 1 [Member]
Fair Value, Inputs, Level 2 [Member]
Level 2 [Member]
Fair Value, Inputs, Level 3 [Member]
Level 3 [Member]
Components recognized in other comprehensive income
Net loss (gain)
Cost to be amortized from accumulated other comprehensive income into net periodic benefit cost in next fiscal year
Fair Value Measurements
Fair Value Disclosures [Text Block]
Fair Value and Related Carrying Amount of Certain Financial Instruments
Quarterly Financial Information (Unaudited)
Quarterly Financial Information [Text Block]
Principal amount of senior notes outstanding
Net Cash Used in Investing Activities of Continuing Operations
Net Cash Provided by (Used in) Investing Activities, Continuing Operations
Net Cash Provided by Financing Activities of Continuing Operations
Net Cash Provided by (Used in) Financing Activities, Continuing Operations
Cash provided by operating activities of discontinued operations
Cash Provided by (Used in) Operating Activities, Discontinued Operations
Cash used in investing activities of discontinued operations
Cash Provided by (Used in) Investing Activities, Discontinued Operations
Cash used in financing activities of discontinued operations
Cash Provided by (Used in) Financing Activities, Discontinued Operations
Funded status
Prior service cost
Recognized prior service cost
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax
Treasury stock - 0.4 million and 0.1 million shares at December 31, 2011 and 2010, respectively
Treasury Stock, Value
Quarterly Financial Information (Unaudited) [Abstract]
Tax expense (benefit) on recognized prior service cost
Accumulated Other Comprehensive Income (after tax)
Cash and Cash Equivalents [Member]
Internal Revenue Service (IRS) [Member]
Assets
Derivative Assets [Abstract]
Total amount recognized in AOCI
Change in notes receivable
Expected dividend yield, range (in hundredths)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Range of Dividends Used
Other operating expenses
Other noncurrent assets
OPERATING EXPENSES
Operating expenses
Total Operating Expenses
Operating Expenses
Earnings Per Common Share Attributable to QEP
Earnings per common share attributable to QEP
Per share information attributable to QEP
Earnings Per Share
Schedule of Equity Method Investments [Table]
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest
Schedule of Equity Method Investment, Equity Method Investee, Name [Axis]
Schedule of Equity Method Investments [Line Items]
Schedule of Property, Plant and Equipment [Table]
Schedule of Impaired Long-Lived Assets Held and Used [Table]
Common stock, par value (in dollars per share)
Treasury stock (in shares)
Tax expense (benefit) on gains (losses) on changes in unrealized fair value of derivatives designated as cash flow hedges
Property, Plant and Equipment by Type [Axis]
Property, Plant and Equipment [Line Items]
Impaired Long-Lived Assets Held and Used [Line Items]
Capitalized Interest
Interest Expense, Policy [Policy Text Block]
Total Common Shareholders' Equity
Stockholders' Equity Attributable to Parent
Asset Retirement Obligations
Deferred tax assets
Deferred tax liabilities
Property, plant and equipment
Regulation of Underground Storage
Regulated Jurisdictions, Policy
Income taxes
Income Tax Expense (Benefit)
Reserve Quantities by Type of Reserve [Axis]
Type of Reserve [Domain]
Natural Gas Reserves [Member]
Natural Gas Liquids Reserves [Member]
Capitalized Exploratory Well Costs
Suspended Well Costs Disclosure [Text Block]
Net changes in capitalized exploratory well costs [Roll Forward]
Balance at beginning of period
Balance at end of period
Capitalized Exploratory Well Costs that Have Been Capitalized for Period of One Year or Less
Oil Reserves [Member]
Scenario, Previously Reported [Member]
Prior periods presentation of revenues
Volume-weighted average depreciation, depletion and amortization rates of capitalized costs (in dollars per Mcfe)
Equity from Questar
Amount of equity contributed by Questar prior to the spin off
Depreciation, depletion and amortization
Full Cost Method Using Gross Revenue Method, Policy [Policy Text Block]
Capitalized Exploratory Well Costs [Abstract]
Effect of derivative instruments not designated as hedges [Abstract]
Fair Value of Derivative Contracts, Gross [Abstract]
Liabilities
Derivative Liabilities [Abstract]
Total liabilities
Marketing and other
Property, Plant and Equipment, Other, Gross
Percentage of total
Statement, Equity Components [Axis]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Equity Component [Domain]
Exercise price range, lower range limit (in dollars per share)
Accrued capital expenditures
Capital Expenditures Incurred but Not yet Paid
Options by exercise price range [Abstract]
Options Outstanding [Abstract]
Share-based compensation
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures
Exercised (in shares)
Comprehensive Income
Stockholders' Equity, Policy [Policy Text Block]
Statement, Business Segments [Axis]
Segment, Geographical [Domain]
Statement, Geographical [Axis]
Proved Reserves, beginning of period
Proved Reserves, end of period
Proved Developed Reserves (Volume)
Proved developed reserves (Volume) ending balance
Proved Developed Reserves (Volume)
Options Outstanding [RollForward]
Weighted-Average Price [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Restricted Shares Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Weighted-Average Price [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Stock Options - Fair Value Assumptions
Balance (in shares)
Balance (in shares)
Shares, Issued
NET INCOME
Net income
Net income
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Net income attributable to noncontrolling interest
Net Income (Loss) Attributable to Noncontrolling Interest
Weighted-average common shares outstanding
Components of basic and diluted shares used in the EPS calculation [Abstract]
Fair value of derivative contracts
Derivative Instruments and Hedges, Liabilities
INCOME FROM CONTINUING OPERATIONS
Income from continuing operations
Less Accumulated Depreciation, Depletion and Amortization
Depreciation, depletion and amortization
Depreciation, Depletion and Amortization
Other comprehensive income (loss), net of tax:
Comprehensive income
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Comprehensive income attributable to noncontrolling interests
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest
Total Equity
Balances
Balances
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
Noncontrolling Interest [Member]
Commitments and contingencies
Adjustments to reconcile net income to net cash provided by operating activities:
Senior Notes [Abstract]
Long-term Debt, Type [Axis]
Accounts payable and accrued expenses
Accounts Payable and Accrued Liabilities, Current
Production and property taxes
Interest payable
Long-term Debt, Type [Domain]
Defined Benefit Plan by Plan Asset Categories [Axis]
Plan Asset Categories [Domain]
Defined Benefit Plan, Fair Value of Plan Assets by Measurement [Axis]
Fair Value Plan Asset Measurement [Domain]
Performance measurement period for each investment manager
Other long-term liabilities
Production and property taxes
Production and property taxes
Production Tax Expense
Additions to capitalized exploratory well costs pending the determination of proved reserves
Reclassifications to property, plant and equipment after the determination of proved reserves
Reclassification to Well, Facilities, and Equipment Based on Determination of Proved Reserves
Capitalized exploratory well costs charged to expense
Capitalized Exploratory Well Cost, Charged to Expense
Prepaid expenses and other
Capitalized interest
Revenues from unaffiliated customers
Revenues from affiliated customers
Segment Reporting Information, Intersegment Revenue
Segment [Domain]
Intersegment Elimination [Member]
Interco Transactions [Member]
Other Assets
Other Assets [Abstract]
Fair Value, Measurement Frequency [Domain]
Fair Value, Measurements, Fair Value Hierarchy [Domain]
Fair Value, Measurements, Recurring [Member]
Other
Consolidation of noncontrolling interest
Settlements
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements
Federal income taxes
CASH PROVIDED BY (USED IN) CONTINUING OPERATIONS
Net Cash Provided by (Used in) Continuing Operations
Long-term debt extinguishment costs
Payments of Debt Extinguishment Costs
Principles of Consolidation
Balance at January 1,
Balance at December 31,
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves
Capitalized exploratory well costs
Fair Value, Hierarchy [Axis]
Fair Value by Measurement Frequency [Axis]
Changes in Asset Retirement Obligation
Components of Deferred Taxes
Components of Income Tax Expense
Effective Income Tax Rate Reconciliation
Fair Value, Balance Sheet Groupings
Components of basic and diluted shares used in EPS calculation
Commitments and Contingencies [Abstract]
Questar common stock issued, net of repurchase (in shares)
Income Taxes [Abstract]
Fair Value Measurements [Abstract]
Debt [Abstract]
Gas and oil properties
Full Cost or Successful Efforts, Policy [Policy Text Block]
Marketing and other
Employee Benefits [Abstract]
Employee Benefits (Tables) [Abstract]
Compensation and Retirement Disclosure [Abstract]
Unaudited quarterly financial information
Fair Value of Plan Assets
Pension and Other Postretirement Benefit Costs
Weighted-Average Assumptions Used to Calculate Benefit Obligations and Benefit Costs
Significant Unobservable Inputs Reconciliation
Expected Benefit Payments
Schedule of Expected Benefit Payments [Table Text Block]
Stock Option Activity
Fair Value of Stock Options Granted and Major Assumptions Used
Derivative Volumes and Average Prices
Long-term debt
Derivative Instruments
Derivative Contracts [Abstract]
Letters of credit outstanding
Share-Based Compensation
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table]
Other Pension Plans, Defined Benefit [Member]
Funded Pension Plan [Member]
Other Pension Plans, Postretirement or Supplemental Plans, Defined Benefit [Member]
Unfunded Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Use of Estimates
Business Segments
Segment Reporting, Policy [Policy Text Block]
Debt Outstanding
Supplemental Gas and Oil Information (Unaudited) [Abstract]
Oil and Gas Exploration and Production Industries Disclosures [Abstract]
Summary of Significant Accounting Policies [Abstract]
Investment in Unconsolidated Affiliates
Environmental Claims [Abstract]
Discontinued Operations [Abstract]
Operations By Line Of Business [Abstract]
Schedule of Valuation and Qualifying Accounts [Abstract]
Proved Undeveloped Reserve (Volume)
Proved undeveloped reserves (Volume) ending balance
Proved Undeveloped Reserve (Volume)
Coupon rate, maximum (in hundredths)
Coupon rate, minimum (in hundredths)
Tax expense (benefit) on prior service cost incurred
Derivative Instrument Risk [Axis]
Income Tax Authority [Axis]
Share-based compensation (in shares)
Expected life, maximum (in years)
Expected life, minimum (in years)
Expected price volatility, minimum (in hundredths)
Expected price volatility, maximum (in hundredths)
Risk-free interest rate, minimum (in hundredths)
Risk-free interest rate, maximum (in hundredths)
Vesting period, minimum (in years)
Vesting period, maximum (in years)
Netting and Collateral [Member]
Total expenses
Results of Operations, Expense from Oil and Gas Producing Activities
Future Contractual Obligations [Abstract]
After 2016
Unrecorded Unconditional Purchase Obligation, Due after Five Years
Realized gains and losses included in revenues
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings
Unrealized gains and losses included in other comprehensive income
Average Swap price per unit ($ per unit)
Debt securities, average maturities, maximum
Debt securities, average maturities, minimum
Reporting Entity [Member]
QEP [Member]
Weighted- Average Remaining Term in Years (in years)
Weighted-Average Exercise Price (in dollars per share)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price
Weighted-Average Exercise Price (in dollars per share)
Aggregate Intrinsic Value
Restricted Shares and Performance Share Units Activity
Revenue Recognition
Maturity of senior notes, earliest
Maturity of senior notes, latest
Derivatives, Fair Value, by Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Derivatives, Fair Value [Line Items]
Commodity Contract [Member]
Costless Collars [Member]
Income Statement and Other Comprehensive Income (Loss) Location [Domain]
Effects of Derivative Transactions
Derivative Instruments, Gain (Loss) by Income Statement Location [Axis]
Gains (losses) reclassified from AOCI into income for the effective portion of hedges [Abstract]
Loss recognized in income for the ineffective portion of hedges [Abstract]
Interest and other income
Gains (losses) reclassified from AOCI into income for the effective portion of hedges
Gains (losses) recognized in AOCI for the effective portion of hedges
Derivative Contract Type [Domain]
Fair Value of Derivative Contracts
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Amendment Flag
Current Fiscal Year End Date
Document Period End Date
Entity [Text Block]
Entity [Domain]
Entity Well-known Seasoned Issuer
Entity Voluntary Filers
Entity Current Reporting Status
Entity Filer Category
Entity Public Float
Entity Registrant Name
Entity Central Index Key
Entity Common Stock, Shares Outstanding
Document Fiscal Year Focus
Document Fiscal Period Focus
Legal Entity [Axis]
Document Type
Total Volume (in Bcf, Mbbl, millions of gallons, millions of MMBtu)
Midstream Field Services
Natural gas gathering systems and treating plants.
Midstream field services
Accumulated Depreciation Midstream Field Services
Accumulated depreciation of natural gas gathering systems and treating plants.
Midstream field services
Total Other Assets
Sum of noncurrent assets excluding property, plant and equipment and investment in unconsolidated affiliates, as of the balance sheet date.
Total Other Assets
Gas and oil properties [Abstract]
Gas and oil properties
Capitalized interest [Abstract]
Capitalized Interest
Credit Risk [Abstract]
Credit Risk
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Before Tax Effect
Accumulated change, before tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.
Accumulated Other Comprehensive Income
Checks outstanding in excess of cash balances, fair value disclosure
The fair value amount of checks outstanding in excess of cash balances whether such amount is presented as a separate caption or as a parenthetical disclosure.
Checks outstanding in excess of cash balances
Number of compressor stations in violation of the Clear Air Act
The number of compressor stations alleged in violation of the Clear Air Act
Number of compressor stations alleged to be in violation of the Clear Air Act
Commitments [Abstract]
Effective tax rate reconciliation, increase decrease [Abstract]
Increase (decrease) in rate as a result of:
Amounts and Expiration Dates of Operating Loss and Tax Credit Carryforwards [Abstract]
Deferred Tax Assets, Net Operating Loss and Tax Credit Carryforwards
The sum of the tax effects as of the balance sheet date of the amount of excesses of tax deductions over gross income and excess tax credits in a year which cannot be used on the tax returns in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset.
Total
Credit Arrangements [Abstract]
Closing price of common stock
This element represents the closing prices used to determine the ratio utilized to modify the exercise price of options and the grant-day prices of restricted shares.
Closing price of common stock (in dollars per share)
Ratio of closing prices
This element represents the ratio of the closing prices of Questar and QEP stock at June 30, 2010. The ratio was used to modify exercise price of options and grant-day prices of restricted shares related to the Spin Off.
Percentage of closing price used to modify exercise price of options and grant-day prices of restricted shares (in hundredths)
Share-based Compensation Arrangement by Share-based award, expected dividend yield, minimum
The estimated minimum dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.
Expected dividend yield (in hundredths)
Share-based compensation arrangement by share-based payment award, fair value assumptions, fair value of options at grant date, range
The range of grant-date fair value of options granted during the reporting period.
Fair value of options at grant date, range (in dollars per share)
Options Exercisable [Abstract]
Unvested Options [Abstract]
Share-based Compensation, Shares by Exercise Price Range, Unvested Options, Number
The number of unvested stock options by exercise price range as of the balance sheet date.
Number Unvested (in shares)
Share-based Compensation, Shares by Exercise Price Range, Unvested Options, Weighted-Average Exercise Price
As of the balance sheet date, the weighted-average exercise price for outstanding unvested stock options.
Unvested Options Weighted-Average Exercise Price (in dollars per share)
The weighted-average vesting period
The period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways.
Weighted-average vesting period (in months)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Released in Period, Weighted Average Grant Date Fair Value
The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option released in period.
Weighted-Average Price, Vested (in dollars per share)
Number Of Questar Unvested Shares Expenses
Number of Questar unvested shares expensed relating to the Spin-off.
Number of Unvested shares of Questar stock at Spin Off to be expensed by QEP (in shares)
Weighted-average price per share of unvested shares expensed
The weighted-average per share prices paid for Questar unvested shares expensed relating to the Spin-off.
Weighted Average Price Per Share Of Questar Unvested Shares Expensed (in dollars per share)
Restricted Shares and Performance Share Units [Abstract]
Derivative - Contract Year
The contract year for the derivative contract.
Accrued capital costs included in development costs
Represents capital costs accrued for the development of proved reserves.
Additional volumes more than one location away from existing producing well included in Extensions and discoveries
Represents additional volumes more than one location away from existing producing well which are included in extensions and deliveries.
Reserves not expected to be developed within five years
Represents reserves located within the northern portion of the Company's Pinedale Anticline leasehold in western Wyoming that are not expected to be developed within five years.
Maximum scheduled development period for proved undeveloped reserves (in years)
The number of years scheduled from the date such locations were originally disclosed as proved undeveloped reserves to fulfill development.
Estimated future costs to develop booked proved undeveloped reserves year two
The estimated future costs to develop booked proved undeveloped reserves two years subsequent to the balance sheet date.
Estimated future costs to develop booked proved undeveloped reserves two years out
Estimated future costs to develop booked proved undeveloped reserves year three
The estimated future costs to develop booked proved undeveloped reserves three years subsequent to the balance sheet date.
Discount rate for cash flows relating to proved reserves
Discount rate used for measuring future cash flows relating to proved reserves
Discount rate for cash flows (in hundredths)
Net change due to purchases and sales of reserves in place
The net change in the discounted value of the proved oil and gas reserves due to financial transactions where new reserves in place were purchased or sold.
Principal Sources of Change in Standardized measure of Discounted Future Net Cash Flows [Table Text Block]
Tabular disclosure of the sources of changes in the standardized measure of discounted future net cash flows during the period.
Principal Sources of Change in Standardized measure of Discounted Future Net Cash Flows
Estimated future costs to develop booked proved undeveloped reserves in next fiscal year
Estimated future costs to develop booked proved undeveloped reserves in the next fiscal year following the balance sheet date.
Estimated future costs to develop booked proved undeveloped reserves in next fiscal year
Property acquistions [Abstract]
Property acquistions
Derivative, Gain (Loss) on Derivative, Net after tax
Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, after tax effects.
Costs Incurred To Advance The Development Of Proved Undeveloped Reserves
The costs incurred during the period to advance the development of reserves that were classified as proved undeveloped.
Costs incurred to develop proved undeveloped reserves
Aggregate Intrinsic Value [Abstract]
Intrinsic Value [Abstract]
Nature of Business [Policy Text Block]
Provides an entity's explanation on the nature of the company's business
Nature of Business
Number of employees in the defined benefit pension and postretirement medical plans
The number of employees under coverage of the pension and postretirement defined benefit plan set up in the spin of.
Number of employees under coverage in the defined benefit pension and postretirement medical plans in association with the spin off (in heads)
Pension And Other Post Retirement Liablities Transferred From Spin Off
At the Spin-off, Questar transferred certain assets and liabilities from its defined-benefit pension and postretirement medical plans related to QEP employees into QEP's newly established plans. The transfer resulted in the establishment of liabilities of $54.9 million related to the unfunded portions of the defined-benefit pension plans and other postretirement benefits with corresponding amounts in AOCI.
Liabilities related to the unfunded portions of the pension plans and other postretirement benefits with corresponding amounts in AOCI at Spin Off
Unitah Basin Field Services LLC [Member]
Unitah Basin Field Services LLC
Three Rivers Gathering LLC [Member]
Three Rivers Gathering LLC
Southern Region [Member]
The assets in the Southern region were impaired and written down to estimated fair value
Northern Region [Member]
The assets in the Northern region were impaired and written down to estimated fair value
US Impaired Long Lived Assets Held and Used By Region [Axis]
This element represents the categories used to group impaired long-lived assets held and used by the region the asset is being used.
Impaired long lived assets held and used by region [Domain]
The region of the impaired assets to be held and used by the entity
Wexpro [Member]
Wexpro Company (Wexpro), formerly a wholly-owned subsidiary of QEP.
Basis-Only Swaps [Member]
Basis-only swaps [Member]
Variation on interest-rate swap contracts where both rates are variable but are tied to different index rates. For example, one party's rate maybe indexed to three-month London Interbank Offered Rate (LIBOR) while the other party's rate is indexed to six-month LIBOR.
Fixed-price swaps [Member]
A forward-based contract in which two parties agree to swap streams of payments over a specified period. The payment streams are based on an agreed-upon (or notional) principal amount. The term notional is used because swap contracts generally involve no exchange of principal at either inception or maturity. Rather, the notional amount serves as a basis for calculation of the payment streams to be exchanged.
Oil Sales [Member]
Oil Sales (Bbls) [Member]
Derivative contracts utilized for oil sales.
Gathering, Processing and Other [Member]
Derivative contracts used for gathering, processing and other
Propane Sales [Member]
Propane Sales (Gals) [Member]
Derivative contracts to manage price risk on extracted NGL volumes.
Natural Gas Sales [Member]
Natural Gas Sales (MMbtu) [Member]
Derivative contracts to lock in a margin on natural gas volumes placed into storage.
Gas Purchases [Member]
Gas Purchases (millions of MMBtu) [Member]
Derivative contracts to lock in a margin on natural gas volumes placed into storage.
Purchased Gas and Oil Sales [Member]
Derivative contracts recognized in income as purchased gas and oil sales.
Purchased Gas and Oil Expense [Member]
Derivative contracts recognized in income as purchased gas and oil expense.
Gas [Member]
Gas (Bcf) [Member]
Derivative contracts related to gas production.
QEP Marketing [Member]
QEP Marketing for commodity derivatives transactions
Ethane Sales [Member]
Ethane Sales (Gals) [Member]
Ethane Sales - (ethane is a colorless, odorless gas)
QEP Field Services [Member]
All volumes and swap price transactions for commodity derivative contracts related to QEP Field Services.
Short-term [Member]
Derivative contracts with maturities of one year or less.
Long-term [Member]
Derivative contracts with maturities in excess of one year.
Year 2012 [Member]
2012 [Member]
Derivative contracts which settle in 2012.
Year 2013 [Member]
2013 [Member]
Derivative contracts which settle in 2012.
IFNPCR [Member]
Energy Commodities Exchange Abbreviation
IFPEPL [Member]
Energy Commodities Exchange Abbreviation
NYMEX [Member]
Energy Commodities Exchange Abbreviation
NYMEX WTI [Member]
Energy Commodities Exchange Abbreviation
Mt. Belvieu Ethane [Member]
Energy Commodities Exchange Abbreviation
Mt. Belvieu Propane [Member]
Energy Commodities Exchange Abbreviation
Derivative Contract Year [Axis]
Tabular presentation of derivative instruments by year of contract.
Derivative Contract Year [Domain]
Tabular presentation of derivative instruments by year of contract.
Energy Commodities Exchange [Axis]
Exchange where various commodities and derivatives products are traded
Energy Commodities Exchange Abbreviation [Domain]
Exchange abbreviation where various commodities and derivatives products are traded.
Senior Notes Due 2011 [Member]
Senior Notes due 2011.
Senior Notes Due 2016 [Member]
Senior Notes Due 2016.
Senior Notes Due 2018 [Member]
Senior Notes Due 2018.
Senior Notes Due 2020 [Member]
Senior Notes Due 2020.
Senior Notes Due 2021 [Member]
Senior Notes Due 2021.
Previous Revolving Credit Facility [Member]
The previous revolving credit facility which was replaced in the third quarter of 2011.
Current [Member]
The current portion of the deferred tax asset or liability.
Noncurrent [Member]
The noncurrent portion of the deferred tax asset or liability.
Deferred Income Tax Assets and Liabilities, by Balance Sheet Classification [Table]
Deferred Income Tax Assets and Liabilities, by Balance Sheet Classification [Axis]
Tabular presentation of deferred tax assets and liabilities by balance sheet classification, i.e., current and noncurrent.
Deferred Tax Assets and Liabilities, Current or Noncurrent [Domain]
Tabular presentation of deferred tax assets and liabilities by balance sheet classification, i.e., current and noncurrent.
Deferred Income Tax Assets and Liabilities, by Balance Sheet Classification [Line Items]
Entity [Member]
Questar [Member]
Former parent of Questar Market Resources.
Performance Share Units [Member]
Incremental common shares attributable to performance share units.
Range of Exercise Prices A [Member]
Exercise Price Range $7.78 - $11.89 [Member]
Supplementary information on outstanding and exercisable share awards as of the balance sheet date which stratifies outstanding options by ranges of exercise price A.
Range of Exercise Prices B [Member]
Exercise Price Range $19.37 - $27.84
Supplementary information on outstanding and exercisable share awards as of the balance sheet date which stratifies outstanding options by ranges of exercise price B.
Range of Exercise Prices C [Member]
Exercise Price $39.07
Supplementary information on outstanding and exercisable share awards as of the balance sheet date which stratifies outstanding options by ranges of exercise price C.
Domestic Equity Securities [Member]
This category includes information about ownership interests or the right to acquire ownership interests in corporations and other legal entities which ownership interest is represented by shares of common or preferred stock (which is neither mandatorily redeemable no redeemable at the option of the holder), convertible securities, stock rights, or stock warrants.
Foreign Equity Securities [Member]
This category includes information about ownership interests or the right to acquire ownership interests in corporations and other legal entities which ownership interest is represented by shares of common or preferred stock (which is neither mandatorily redeemable no redeemable at the option of the holder), convertible securities, stock rights, or stock warrants.
Developed Market Foreign Equity Securities [Member]
This category includes information about ownership interests or the right to acquire ownership interests in corporations and other legal entities which ownership interest is represented by shares of common or preferred stock (which is neither mandatorily redeemable no redeemable at the option of the holder), convertible securities, stock rights, or stock warrants.
Emerging Market Foreign Equity Securities [Member]
This category includes information about ownership interests or the right to acquire ownership interests in corporations and other legal entities which ownership interest is represented by shares of common or preferred stock (which is neither mandatorily redeemable no redeemable at the option of the holder), convertible securities, stock rights, or stock warrants.
QEP Energy [Member]
QEP Energy Company, (QEP Energy) acquires, explores for, develops and produces natural gas, oil, and natural gas liquids (NGL).
QEP Marketing and Other [Member]
QEP Marketing Company (QEP Marketing) markets affiliate and third-party natural gas and oil, provides risk-management services, and owns and operates an underground gas-storage reservoir. Other includes other marketing businesses.
Qep Resources[Member]
QEP Resources includes items not attributable to any other line of business.
QEP Consolidated [Member]
The consolidated amount from the various business segments
Total Reserves Natural Gas Equivalent [Member]
This element represents total natural gas, oil and natural gas liquids reserves, presented as natural gas equivalents.
Gas and Oil exploration [Member]
Gas and Oil exploration -relating to gas and oil exploration and development activities.
Developed [Member]
Quantities of proved reserves which are classified as developed.
Undeveloped [Member]
Quantities of proved reserves which have not been developed as of the balance sheet date.
Perforamce revision [Member]
The reserve adjustment based on historical production benchmarks
Other revision [Member]
The reserve adjustment based on other benchmarks
Volume revision [Member]
The reserve adjustment based on geological discoveries
Haynesville Cotton Valley area [Member]
Haynesville Cotton Valley area
Unita Basin [Member]
Unita Basin
Pinedale area [Member]
Pinedale area
Black Fork II plant [Member]
Black Fork II plant
Reserve Quantities, Developed and Undeveloped [Axis]
Tabular disclosure of proved reserves by development status.
Reserve Quantities, Developed and Undeveloped [Domain]
Tabular disclosure of proved reserves by development status.
Reserve estimate adjustment [Axis]
The different types of reserve revision adjustments
Type of adjustments [Domain]
The various types of reserve adjustments