Restructuring Costs [Abstract]
Restructuring Costs
Restructuring and Related Activities Disclosure [Text Block]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
De-designation of commodity derivative contracts [Abstract]
De designation of commodity derivative contracts [Abstract]
-- None. No documentation exists for this element. --
Unrealized gain (Loss) on derivatives contract
Unrealized Gain (Loss) on Derivatives
Schedule of Error Corrections and Prior Period Adjustment Restatement [Table]
Schedule of Error Corrections and Prior Period Adjustment Restatement [Table]
Statement, Scenario [Axis]
Scenario [Axis]
Scenario, Unspecified [Domain]
Scenario, Unspecified [Domain]
Prior periods presentation of revenues [Member]
Scenario, Previously Reported [Member]
Restatement Adjustment [Member]
Restatement Adjustment [Member]
Legal Entity [Axis]
Legal Entity [Axis]
Entity [Domain]
Entity [Domain]
QEP Field Services [Member]
QEP Field Services [Member]
All volumes and swap price transactions for commodity derivative contracts related to QEP Field Services.
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
REVENUES
Revenues [Abstract]
Natural gas sales
Natural Gas Production Revenue
Oil sales
Oil and Condensate Revenue
NGL sales
Natural Gas Midstream Revenue
Gathering, processing and other
Gas Gathering, Transportation, Marketing and Processing Revenue
OPERATING EXPENSES
Operating Expenses [Abstract]
Natural gas, oil and NGL transportation and other handling costs
Shipping, Handling and Transportation Costs
Earnings Per Share [Abstract]
Components of basic and diluted shares used in EPS
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Commitments and Contingencies Disclosure [Abstract]
Contingencies
Commitments and Contingencies Disclosure [Text Block]
Anti-dilutive shares not included in diluted common share outstanding (in shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Weighted-average basic common shares outstanding (in shares)
Weighted Average Number of Shares Outstanding, Basic
Potential number of shares issuable upon excerise of in-the-money stock options under the Long-term Stock Incentive Plan
Incremental Common Shares Attributable to Share-based Payment Arrangements
Average diluted common shares outstanding (in shares)
Weighted Average Number of Shares Outstanding, Diluted
Reconciliation of QEP Energy's restructuring cost
Schedule of Restructuring and Related Costs [Table Text Block]
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
Compensation and Retirement Disclosure [Abstract]
Employee Benefits
Pension and Other Postretirement Benefits Disclosure [Text Block]
Asset Retirement Obligation [Abstract]
Asset Retirement Obligations
Asset Retirement Obligation Disclosure [Text Block]
Acquisitions [Abstract]
Acquisitions [Abstract]
Acquisitions [Text Block]
Mergers, Acquisitions and Dispositions Disclosures [Text Block]
Income Statement [Abstract]
Natural gas sales
Oil sales
NGL sales
Purchased gas, oil and NGL sales
Refining and Marketing Revenue
Total Revenues
Oil and Gas Revenue
Purchased gas, oil and NGL expense
Refining and Marketing Costs
Lease operating expense
Oil and Gas Property, Lease Operating Expense
Gathering, processing and other
Gas Gathering, Transportation, Marketing and Processing Costs
General and administrative
General and Administrative Expense
Production and property taxes
Production Tax Expense
Depreciation, depletion and amortization
Results of Operations, Depreciation, Depletion, Amortization and Accretion
Exploration expenses
Exploration Expense
Abandonment and impairment
Asset Impairment Charges
Total Operating Expenses
Operating Expenses
Net gain from asset sales
Gain (Loss) on Sale of Property Plant Equipment
OPERATING (LOSS) INCOME
Operating Income (Loss)
Realized and unrealized gains on derivative contracts (See Note 7)
Gain on Derivative Instruments, Pretax
Interest and other (loss) income
Interest Income, Operating
Income from unconsolidated affiliates
Income (Loss) from Equity Method Investments
Loss from early extinguishment of debt
Gains (Losses) on Extinguishment of Debt
Interest expense
Interest Expense
(LOSS) INCOME BEFORE INCOME TAXES
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest
Income tax benefit (provision)
Income Tax Expense (Benefit)
NET (LOSS) INCOME
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Net income attributable to noncontrolling interest
Net Income (Loss) Attributable to Noncontrolling Interest
NET (LOSS) INCOME ATTRIBUTABLE TO QEP
Net Income (Loss) Attributable to Parent
Earnings Per Common Share Attributable to QEP
Basic total (in dollars per share)
Earnings Per Share, Basic
Diluted total (in dollars per share)
Earnings Per Share, Diluted
Weighted-average common shares outstanding
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Used in basic calculation (in shares)
Used in diluted calculation (in shares)
Dividends per common share (in dollars per share)
Common Stock, Dividends, Per Share, Cash Paid
Fair Value Disclosures [Abstract]
Fair Value Measurements
Fair Value Disclosures [Text Block]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Contracts
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Schedule of Environmental Exit Cost [Table]
Schedule of Environmental Exit Cost [Table]
Environmental Exit Cost by Property [Axis]
Environmental Exit Cost by Property [Axis]
Environmental Exit Costs, Name of Property [Domain]
Environmental Exit Costs, Name of Property [Domain]
Environmental Exit Cost [Line Items]
Environmental Exit Cost [Line Items]
Environmental Exit Costs, Anticipated Cost
Environmental Exit Costs, Anticipated Cost
Environmental Costs Recognized, Capitalized
Environmental Costs Recognized, Capitalized
Loss Contingency, Settlement Agreement, Date
Loss Contingency, Settlement Agreement, Date
Gain (Loss) Related to Litigation Settlement
Gain (Loss) Related to Litigation Settlement
Contribution payable to non profit corporation or trust created by Ute Idian tribe
Contribution payable to non profit corporation or trust created by Ute Idian tribe
The amount of the civil penalty that will be contributed to a non-profit corporation or trust to be created by the Ute Indian Tribe of the Uintah and Quray reservation at the end of the period.
Loss Contingency, Settlement Agreement, Counterparty's Name
Loss Contingency, Settlement Agreement, Counterparty's Name
Share-based Compensation [Abstract]
Share-Based Compensation
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Statement of Other Comprehensive Income [Abstract]
Other comprehensive income (loss), tax
Other Comprehensive Income (Loss), Tax [Abstract]
Tax expense (benefit) on gains (losses) on changes in unrealized fair value of derivatives designated as cash flow hedges
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax
Pension and other postretirement plans adjustments:
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract]
Tax expense (benefit) on net unamortized gain (loss) incurred
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized (Gain) Loss Arising During Period, Tax
Tax expense (benefit) on prior service cost incurred
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Tax
Net (loss) income
Other comprehensive (loss) income, net of tax:
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Reclassification of previously deferred derivative gains(1)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax
Amortization of net actuarial loss
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax
Amortization of 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
Total pension and other postretirement plans adjustments
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax
Other comprehensive loss
Other Comprehensive Income (Loss), Net of Tax
Comprehensive (loss) 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
Comprehensive (loss) income attributable to QEP
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Document and Entity Information [Abstract]
-- None. No documentation exists for this element. --
Entity Registrant Name
Entity Registrant Name
Entity Central Index Key
Entity Central Index Key
Current Fiscal Year End Date
Current Fiscal Year End Date
Entity Well-known Seasoned Issuer
Entity Well-known Seasoned Issuer
Entity Voluntary Filers
Entity Voluntary Filers
Entity Current Reporting Status
Entity Current Reporting Status
Entity Filer Category
Entity Filer Category
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Document Type
Document Type
Amendment Flag
Amendment Flag
Document Period End Date
Document Period End Date
Segment Reporting [Abstract]
Operations by Line of Business
Segment Reporting Disclosure [Text Block]
Derivative Volumes and Average Prices
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
Fair values of Derivatives by Balance Sheet Location
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Effects of Derivative Transactions
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]
ARO Liability [Roll Forward]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO liability, Beginning Balance
Asset Retirement Obligation
Accretion
Asset Retirement Obligation, Accretion Expense
Liabilities incurred
Asset Retirement Obligation, Liabilities Incurred
Liabilities settled
Asset Retirement Obligation, Liabilities Settled
ARO liability, Ending Balance
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, by Balance Sheet Grouping [Table]
Fair Value by Measurement Frequency [Axis]
Measurement Frequency [Axis]
Fair Value, Measurement Frequency [Domain]
Fair Value, Measurement Frequency [Domain]
Fair Value, Measurements, Recurring [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Hierarchy [Axis]
Fair Value, Hierarchy [Axis]
Fair Value, Measurements, Fair Value Hierarchy [Domain]
Fair Value, Measurements, Fair Value Hierarchy [Domain]
Level 1 [Member]
Fair Value, Inputs, Level 1 [Member]
Level 2 [Member]
Fair Value, Inputs, Level 2 [Member]
Level 3 [Member]
Fair Value, Inputs, Level 3 [Member]
Netting Adjustments [Member]
Netting [Member]
Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis]
Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis]
Fair Value, Disclosure Item Amounts [Domain]
Fair Value, Disclosure Item Amounts [Domain]
Carrying Amount [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Instrument [Axis]
Financial Instrument [Axis]
Types of Financial Instruments [Domain]
Types of Financial Instruments [Domain]
Commodity derivative [Member]
Commodity Contract [Member]
Interest Rate Swap [Member]
Interest Rate Swap [Member]
Oil and Gas Property or Project [Axis]
Oil and Gas Property or Project [Axis]
Unproved Oil and Gas Property or Major Project [Domain]
Unproved Oil and Gas Property or Major Project [Domain]
Proved properties [Member]
Proved properties [Member]
Represents proved properties and major development projects that are included from the capitalized costs being amortized.
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets
Derivative Assets [Abstract]
Derivative instruments - short-term
Derivative Assets, Current
Derivative instruments - long-term
Derivative Assets, Noncurrent
Total financial assets
Derivative Assets
Cash and Cash Equivalents, Fair Value Disclosure
Cash and Cash Equivalents, Fair Value Disclosure
Financial liabilities
Derivative Liabilities [Abstract]
Derivative instruments - short-term
Derivative Liabilities, Current
Derivative instruments - long-term
Derivative Liabilities, Noncurrent
Total financial liabilities
Derivative Liabilities
Checks outstanding in excess of cash balances
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.
Long-term debt
Long-term Debt, Fair Value
Level 3 Unobservable input reconciliation [Roll Forward]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value
Realized gains and losses
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings
Unrealized gains and losses
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Description
Settlements
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements
Transfers out of Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3
Ending Balance
Impairment of Oil and Gas Properties
Impairment of Oil and Gas Properties
Proved properties, estimated fair values
Proved Oil and Gas Property, Successful Effort Method, Fair Value Disclosure
The fair value of Oil and Gas properties with proved reserves under the successful effort method.
Nature Of Business [Abstract]
-- None. No documentation exists for this element. --
Nature of Business
Nature of Operations [Text Block]
Summary of operating results by line of business
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Statement of Cash Flows [Abstract]
OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities [Abstract]
Adjustments to reconcile net income to net cash provided by operating activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation, depletion and amortization
Depreciation, Depletion and Amortization
Deferred income taxes
Deferred Income Tax Expense (Benefit)
Abandonment and impairment
Share-based compensation
Share-based Compensation
Amortization of debt issuance costs and discounts
Amortization of Financing Costs and Discounts
Dry exploratory well expense
Other Noncash Expense
Net gain from asset sales
Gain (Loss) on Disposition of Assets
Income from unconsolidated affiliates
Distributions from unconsolidated affiliates and other
Proceeds from Equity Method Investment, Dividends or Distributions
Non-cash loss on early extinguishment of debt
Write off of Deferred Debt Issuance Cost
Unrealized gain on derivative contracts
Changes in operating assets and liabilities
Increase (Decrease) in Operating Capital
Net Cash Provided by Operating Activities
Net Cash Provided by (Used in) Operating Activities, Continuing Operations
INVESTING ACTIVITIES
Net Cash Provided by (Used in) Investing Activities [Abstract]
Property acquisitions
Payments to Acquire Oil and Gas Property
Property, plant and equipment, including dry exploratory well expense
Payments to Acquire Oil and Gas Equipment
Proceeds from disposition of assets
Proceeds from Sale of Oil and Gas Property and Equipment
Net Cash Used in Investing Activities
Net Cash Provided by (Used in) Investing Activities, Continuing Operations
FINANCING ACTIVITIES
Net Cash Provided by (Used in) Financing Activities [Abstract]
Checks outstanding in excess of cash balances
Increase (Decrease) in Outstanding Checks, Financing Activities
Long-term debt issued
Proceeds from Issuance of Long-term Debt
Long-term debt issuance costs paid
Payments of Debt Issuance Costs
Long-term debt repaid
Repayments of Senior Debt
Proceeds from credit facility
Proceeds from Lines of Credit
Repayments of credit facility
Repayments of Lines of Credit
Other capital contributions
Proceeds from Other Equity
Dividends paid
Payments of Ordinary Dividends, Common Stock
Excess tax benefit on share-based compensation
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities
Distribution from Questar
Payments of Distributions to Affiliates
Distribution to noncontrolling interest
Payments to Noncontrolling Interests
Net Cash Provided by Financing Activities
Net Cash Provided by (Used in) Financing Activities, Continuing Operations
Change in cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Beginning cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value
Ending cash and cash equivalents
Supplemental Disclosures:
Supplemental Cash Flow Elements [Abstract]
Cash paid for interest
Interest Paid
Cash paid (received) for income taxes
Income Taxes Paid, Net
Non-cash investing activities
Noncash Investing and Financing Items [Abstract]
Change in capital expenditure accrual balance
Capital Expenditures Incurred but Not yet Paid
Impact of change in transportation and other handling costs
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]
De-designation of commodity derivative contracts
Derivatives, Policy [Policy Text Block]
Transportation and other handling costs
Shipping and Handling Cost, Policy [Policy Text Block]
Impairment of long-lived assets
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]
New accounting pronouncements
New accounting pronouncements [Policy Text Block]
Accounting policy related to new accounting pronouncements.
Basis of Presentation of Interim Consolidated Financial Statements - Impairments [Abstract]
Basis of Presentation of Interim Consolidated Financial Statements - Impairments [Abstract]
Schedule of Impaired Long-Lived Assets Held and Used [Table]
Schedule of Impaired Long-Lived Assets Held and Used [Table]
Geographical [Axis]
Geographical [Axis]
Segment, Geographical [Domain]
Segment, Geographical [Domain]
Southern Region [Member]
Southern Region [Member]
A component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.
Northern Region [Member]
Northern Region [Member]
A component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.
Impaired Long-Lived Assets Held and Used [Line Items]
Impaired Long-Lived Assets Held and Used [Line Items]
Shares available for future grants
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant
Total compensation expense related to share-based compensation
Allocated Share-based Compensation Expense
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table]
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table]
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis]
Award Type [Axis]
Share-based Compensation Arrangements by Share-based Payment Award, Award Type and Plan Name [Domain]
Award Type [Domain]
Stock Options [Member]
Stock Options [Member]
Restricted Stock [Member]
Restricted Stock [Member]
Performance Share Units [Member]
Performance Share Units [Member]
Incremental common shares attributable to performance share units.
Range [Axis]
Range [Axis]
Range [Domain]
Range [Domain]
Maximum [Member]
Maximum [Member]
Minimum [Member]
Minimum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Fair value of options at grant date
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Risk-free interest rate (in hundredths)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum
Expected price volatility (in hundredths)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum
Expected dividend yield (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 life in years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term
Options Outstanding [RollForward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at December 31, 2011 (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number
Granted (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures
Exercised (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period
Forfeited (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period
Outstanding at June 30, 2012 (in shares)
Options Excercisable (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number
Unvested Options (in shares)
Share Based Compensation Arrangement By Share Based Payment Award Options Unvested Number
The number of shares into which unvested stock options outstanding as of the balance sheet date can be currently converted under the option plan.
Weighted-Average Price [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-Average Price, beginning (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Weighted-Average Price, Granted (in dollars per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price
Weighted-Average Price, Exercised (in dollars per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price
Weighted-Average Price, Forfeited (in dollars per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price
Weighted-Average Price, Ending (in dollars per share)
Weighted-Average Price, Options Excercisable
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price
Weighted-Average Price, Unvested Options
hare Based Compensation Arrangement By Share Based Payment Award Options Unvested Weighted Average Exercise Price
The weighted-average price as of the balance sheet date for unvested stock options.
Weighted-Average Price, beginning 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
Weighted-Average Price, Granted (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Weighted-Average Price, Vested (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Weighted-Average Price, Forfeited (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Weighted-Average Price, Ending Balance (in dollars per share)
Weighted-Average Remaining Contractual Term, Outstanding
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term
Aggregate Intrinsic Value, Outstanding
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value
Weighted-Average Remaining Contractual Term, Options Excercisable
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term
Aggregate Intrinsic Value, Options Excercisable
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value
Weighted-Average Remaining Contractual Term, Unvested Options
Share Based Compensation Arrangement By Share Based Payment Award Options Unvested Weighted Average Remaining Contractual Term
The weighted average period between the balance sheet date and expiration for all unvested portions of options outstanding under the plan, which may be expressed in a decimal value for number of years.
Aggregate Intrinsic Value, Unvested Options
Sharebased Compensation Arrangement By Sharebased Payment Award Options Unvested Intrinsic Value1
The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of unvested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.
Intrinsic value of options exercised
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value
Unrecognized compensation cost
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized
Weighted-average period for recognition of compensation costs
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition
Vesting period (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period
Total fair value of stock that vested
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value
Restricted Shares Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance, beginning (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Granted (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
Vested (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period
Forfeited (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Balance, Ending (in shares)
Statement of Financial Position [Abstract]
LIABILITIES AND EQUITY
Liabilities and Equity [Abstract]
EQUITY
Stockholders' Equity Attributable to Parent [Abstract]
Common stock, par value (in dollars per share)
Common Stock, Par or Stated Value Per Share
Common stock, shares authorized (in shares)
Common Stock, Shares Authorized
Common stock, shares issued (in shares)
Common Stock, Shares, Issued
Treasury stock (in shares)
Treasury Stock, Shares
Loss Contingencies [Table]
Loss Contingencies [Table]
Loss Contingency Nature [Axis]
Loss Contingency Nature [Axis]
Loss Contingency, Nature [Domain]
Loss Contingency, Nature [Domain]
Breach of Contract, Fiduciary Duty and Unjust Enrichment Claims [Member]
Breach of Contract, Fiduciary Duty and Unjust Enrichment Claims [Member]
Breach of Contract, Fiduciary Duty and Unjust Enrichment Claims [Member]
Litigation Status [Axis]
Litigation Status [Axis]
Litigation Status [Domain]
Litigation Status [Domain]
Pending Litigation [Member]
Pending Litigation [Member]
Litigation Case [Axis]
Litigation Case [Axis]
Litigation Case Type [Domain]
Litigation Case Type [Domain]
U.S. District Court for Utah [Member]
U.S. District Court for Utah [Member]
U.S. District Court for Utah [Member]
Loss Contingencies [Line Items]
Loss Contingencies [Line Items]
Damages sought
Loss Contingency, Damages Sought, Value
Schedule of Purchase Price Allocation [Table Text Block]
Schedule of Purchase Price Allocation [Table Text Block]
Fair value of financial assets and liabilities
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
Change in fair value of Level 3 assets and liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Fair value and related carrying amount of certain financial instruments
Fair Value, by Balance Sheet Grouping [Table Text Block]
Derivative Contracts [Abstract]
Derivative Contracts [Abstract]
Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table]
Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table]
Derivative, Gain Loss by Income Statement Location [Axis]
Derivative, Gain Loss by Income Statement Location [Axis]
The location and amount of gains and losses reported in the statement of financial performance.
Derivative, Gain (Loss) by Income Statement Location [Domain]
Derivative, Gain (Loss) by Income Statement Location [Domain]
The income statement and other comprehensive income location of gains and losses on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments, by income statement location.
Other Comprehensive Income (Loss) [Member]
Other Comprehensive Income (Loss) [Member]
Natural Gas Sales (MMbtu) [Member]
Natural Gas Sales [Member]
Derivative contracts to lock in a margin on natural gas volumes placed into storage.
NGL Sales [Member]
NGL Sales [Member]
Derivative contracts to lock in a margin on NGL volumes placed into storage.
Oil Sales (Bbls) [Member]
Oil Sales [Member]
Derivative contracts utilized for oil sales.
QEP Marketing [Member]
QEP Marketing [Member]
Represents derivative contracts for QEP Marketing.
Marketing Purchases [Member]
Marketing Purchases [Member]
Marketing Purchases.
Interest Income [Member]
Interest Income [Member]
Realized and unrealized gains on commodity derivative instruments [Member]
Realized and unrealized gains on commodity derivative instruments [Member]
The income statement location of gains and losses on derivative instruments on derivative instruments not designated as hedging instruments, by income statement location.
Derivative Instrument Contract Type [Axis]
Derivative Instrument Contract Type [Axis]
Information by name that identifies a derivative or a group of derivatives by (derivative) contract risk type.
Derivative Instrument Contract Type [Domain]
Derivative Instrument Contract Type [Domain]
The name that identifies a derivative or a group of derivatives, on a disaggregated basis, by contract risk type.
Natural gas derivative contracts [Member]
Natural gas derivative contracts [Member]
Derivative instrument whose primary underlying risk is tied to commodity prices.
Oil derivative contracts [Member]
Oil derivative contracts [Member]
Derivative instrument whose primary underlying risk is tied to commodity prices.
NGL derivative contracts [Member]
NGL derivative contracts [Member]
Derivative instrument whose primary underlying risk is tied to commodity prices.
Business Segments [Axis]
Business Segments [Axis]
Segment [Domain]
Segment [Domain]
QEP Energy [Member]
QEP Energy [Member]
QEP Energy Company, (QEP Energy) acquires, explores for, develops and produces natural gas, oil, and natural gas liquids (NGL).
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Realized gain (loss) on commodity derivative contracts
Realized gain (loss) on commodity derivative contracts not designated as hedging instruments
Represents the realized gain (loss) on commodity derivative contracts not designated as hedging instruments for the period.
Unrealized gain (loss) on commodity derivative contracts
Unrealized gain (loss) on commodity derivative contracts not designated as hedging instruments
Represents the unrealized gain (loss) on commodity derivative contracts not designated as hedging instruments for the period.
Realized and Unrealized Gain (Loss) on Commodity Derivative Contracts Not Designated as Hedging Instruments
Realized and Unrealized Gain (Loss) on Commodity Derivative Contracts Not Designated as Hedging Instruments
Total Realized and Unrealized Gain (Loss) on Commodity Derivative Contracts Not Designated as Hedging Instruments
Total gain (loss) on commodity derivative instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net
Gain (loss) on derivative instruments for the effective portion of hedge recognized in AOCI [Abstract]
Gain (loss) on derivative instruments for the effective portion of hedge recognized in AOCI [Abstract]
-- None. No documentation exists for this element. --
Gain on derivative instruments for the effective portion of hedge recognized in AOCI
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Gain reclassified from AOCI into income for effective portion of hedge
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net [Abstract]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net [Abstract]
Gain recognized in income for the ineffective portion of hedges
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net
Fair value of frozen derivative to be settled and reclassified within twelve months
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months
Debt Disclosure [Abstract]
Debt Outstanding
Schedule of Debt [Table Text Block]
Asset retirement obligations roll forward
Schedule of Change in Asset Retirement Obligation [Table Text Block]
Forecasted production from proved reserves (in hundredths)
Maximum Forecasted Production Covered By Derivatives
Potential maximum amount of forecasted production covered by derivative contracts.
Unrealized gains on derivative contracts
Accumulated Other Comprehensive Income Loss, Cumulative Changes In Gain Loss From Cash Flow Hedges Effect, Before Tax
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.
Unrealized gains on derivative contracts, net of tax
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax
Notional amount of interest rate derivatives
Notional Amount of Interest Rate Derivatives
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Domain]
Long-term Debt, Type [Domain]
Term Loan due 2017 [Member]
Term Loan due 2017 [Member]
Term Loan due in 2017
Derivative Instrument Risk [Axis]
Derivative Instrument Risk [Axis]
Derivative Contract Type [Domain]
Derivative Contract Type [Domain]
Commodity Contract [Member]
Swap [Member]
Swap [Member]
Derivative Instruments, Gain (Loss) by Income Statement Location [Axis]
Income Statement Location [Axis]
Income Statement and Other Comprehensive Income (Loss) Location [Domain]
Income Statement Location [Domain]
QEP Resources [Member]
QEP Resources [Member]
Represents derivative contracts for QEP Resources.
Purchased Gas and Oil Expense [Member]
Purchased Gas and Oil Expense [Member]
Derivative contracts recognized in income as purchased gas and oil expense.
Derivative Contract Year [Axis]
Derivative Contract Year [Axis]
Tabular presentation of derivative instruments by year of contract.
Derivative Contract Year [Domain]
Derivative Contract Year [Domain]
Tabular presentation of derivative instruments by year of contract.
2012 [Member]
Year 2012 [Member]
Derivative contracts which settle in 2012.
2013 [Member]
Year 2013 [Member]
Derivative contracts which settle in 2012.
2014 [Member]
Year 2014 [Member]
Year 2014 [Member]
Energy Commodities Exchange [Axis]
Energy Commodities Exchange [Axis]
Exchange where various commodities and derivatives products are traded
Energy Commodities Exchange Abbreviation [Domain]
Energy Commodities Exchange Abbreviation [Domain]
Exchange abbreviation where various commodities and derivatives products are traded.
NYMEX [Member]
NYMEX [Member]
Energy Commodities Exchange Abbreviation
IFPEPL [Member]
IFPEPL [Member]
Energy Commodities Exchange Abbreviation
IFNPCR [Member]
IFNPCR [Member]
Energy Commodities Exchange Abbreviation
IFCNPTE [Member]
IFCNPTE [Member]
Energy Commodities Exchange Abbreviation.
NYMEX WTI [Member]
NYMEX WTI [Member]
Energy Commodities Exchange Abbreviation
Mt. Belvieu Ethane [Member]
Mt. Belvieu Ethane [Member]
Energy Commodities Exchange Abbreviation
Mt. Belvieu Propane [Member]
Mt. Belvieu Propane [Member]
Energy Commodities Exchange Abbreviation
Derivatives, Fair Value, by Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Short-term [Member]
Short term [Member]
Derivative contracts with maturities of one year or less.
Long-term [Member]
Long term [Member]
Derivative contracts with maturities in excess of one year.
Derivatives, Fair Value [Line Items]
Derivatives, Fair Value [Line Items]
Total principal amount of debt
Long-term Debt, Gross
Year
Derivative Contract Year
The contract year for the derivative contract.
Index
Derivative, Underlying Basis
Derivative Contracts - Volumes and Prices
Summary of Derivative Instruments [Abstract]
Total Volume (in Bcf, Mbbl, millions of gallons, millions of MMBtu)
Derivative, Nonmonetary Notional Amount
Average Swap price per unit ($ per unit)
Derivative, Nonmonetary Notional Amount, Price Per Unit
Collars Floor Price ($ per unit)
Derivative, Floor Price
Collars Ceiling Price ($ per unit)
Derivative, Cap Price
Maturity
Derivative, Maturity Date
Fixed Rate Paid (in hundredths)
Derivative, Fixed Interest Rate
Variable Rate Received
Derivative, Description of Terms
Fair Value of Derivative Contracts, Gross [Abstract]
Derivative, Fair Value, Net [Abstract]
Derivative Asset, Fair Value, Gross
Derivative Asset, Fair Value, Gross Asset
Derivative Liability, Fair Value, Gross
Derivative Liability, Fair Value, Gross Liability
Schedule of calculated fair value of options granted and major assumptions used
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Summary of stock option transactions under the terms of LTSIP
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
Restricted Shares and Performance Share Units Activity
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
Pension and Other Postretirement Benefit Costs
Schedule of Net Benefit Costs [Table Text Block]
Earnings Per Share
Earnings Per Share [Text Block]
Basis of Presentation of Interim Consolidated Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
Revolving Credit Facility due 2016 [Member]
Line of Credit [Member]
6.05% Senior Notes due 2016 [Member]
Senior Notes Due 2016 [Member]
Senior Notes Due 2016.
6.80% Senior Notes due 2018 [Member]
Senior Notes Due 2018 [Member]
Senior Notes Due 2018.
6.80% Senior Notes due 2020 [Member]
Senior Notes Due 2020 [Member]
Senior Notes Due 2020.
6.875% Senior Notes due 2021 [Member]
Senior Notes Due 2021 [Member]
Senior Notes Due 2021.
5.375% Senior Notes due 2022 [Member]
Senior Notes Due 2022 [Member]
Senior Notes Due 2022.
Senior Notes [Member]
Senior Notes [Member]
5.25% Senior Notes Due 2023 [Member]
5.25% Senior Notes Due 2023 [Member]
5.25% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Less unamortized discount
Debt Instrument, Unamortized Discount
Total long-term debt outstanding
Long-term Debt
Long-term debt, interest rate (in hundredths)
Debt Instrument, Interest Rate, Stated Percentage
Maturity date of long-term debt
Debt Instrument, Maturity Date
Maturity period of long-term debt
Debt Instrument Maturity Period
Represents maturity period of debt instrument.
Borrowing capacity
Line of Credit Facility, Current Borrowing Capacity
Potential increased borrowing capacity
Line of Credit Facility, Maximum Borrowing Capacity
Number of maturity date extentions
Number of maturity date extentions
Represents the number of maturity date extensions allowed per the provisions of the credit agreement.
Additional period with in which maturity to be extended
Additional period with in which maturity to be extended
Represents additional period with in which maturity to be extended.
Weighted-average interest rate (in hundredths)
Long-term Debt, Weighted Average Interest Rate
Debt Instrument, Face Amount
Debt Instrument, Face Amount
Proceeds from Issuance of Long-term Debt
Amount outstanding
Line of Credit Facility, Amount Outstanding
Letters of credit outstanding
Letters of Credit Outstanding, Amount
Proceeds from issuance of debt
Proceeds from Issuance of Debt
Debt issuance costs
Debt Instrument, Fee Amount
Senior notes repurchased
Debt Instrument, Repurchase Amount
Principal amount of senior notes outstanding
Senior Notes
Debt Instrument, Maturity Date Range, Start
Debt Instrument, Maturity Date Range, Start
Debt Instrument, Maturity Date Range, End
Debt Instrument, Maturity Date Range, End
Non-cash loss on early extinguishment of debt
Senior Notes, stated interest rate, minimum (in hundredths)
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum
Senior Notes, stated interest rate, maximim (in hundredths)
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum
Debt
Debt Disclosure [Text Block]
Schedule of Restructuring and Related Costs [Table]
Schedule of Restructuring and Related Costs [Table]
Business Segments [Axis]
Restructuring Cost and Reserve [Axis]
Restructuring Type [Axis]
Type of Restructuring [Domain]
Type of Restructuring [Domain]
One-time Termination Benefits [Member]
One-time Termination Benefits [Member]
Employee Relocation [Member]
Employee Relocation [Member]
Termination of Lease [Member]
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs
Restructuring and Related Cost, Expected Cost
Restructuring costs incurred to date
Restructuring and Related Cost, Cost Incurred to Date
Increase (Decrease) in Restructuring Liability [Roll Forward]
Increase (Decrease) in Restructuring Liability [Abstract]
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
Balance at December 31, 2011
Restructuring Reserve
Costs incurred and charged to expense
Restructuring Reserve, Accrual Adjustment
Costs paid or otherwise settled
Restructuring Reserve, Settled with Cash
Balance at September 30, 2012
Number of regional offices created
Number of regional offices created
Represents the number of regional offices created from Consolidation of two offices to make one Regional Head Office.
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
QEP Marketing and Other [Member]
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.
Elimination [Member]
Intersegment Elimination [Member]
Major Customers [Axis]
Major Customers [Axis]
Name of Major Customer [Domain]
Name of Major Customer [Domain]
Unaffiliated customers [Member]
Unaffiliated customers [Member]
Unaffiliated is a party that, indirectly through one or more intermediaries, controls, is controlled by, or is under common control with the entity.
Affiliated customers [Member]
Affiliated Entity [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Assets
Assets
Revenues
Oil and Gas Revenue [Abstract]
Total Revenues
Operating expenses
Natural gas, oil and NGL transportation and other handling costs
Other operating expenses
Other Expenses
Net loss from asset sales
Operating (loss) income
Realized and unrealized gains (losses) on derivative contracts
Interest and other income
Income (loss) before income taxes
Income taxes
Net income (loss) attributable to QEP
ASSETS
Assets [Abstract]
Current Assets
Assets, Current [Abstract]
Cash and cash equivalents
Accounts receivable, net
Accounts Receivable, Net, Current
Fair value of derivative contracts
Derivative Instruments and Hedges, Assets
Inventories, at lower of average cost or market
Inventory, Net [Abstract]
Gas, oil and NGL
Energy Related Inventory
Materials and supplies
Inventory, Raw Materials and Supplies, Gross
Prepaid expenses and other
Prepaid Expense and Other Assets, Current
Total Current Assets
Assets, Current
Property, Plant and Equipment (successful efforts method for gas and oil properties)
Property, Plant and Equipment, Net [Abstract]
Proved properties
Proved Oil and Gas Property, Successful Effort Method
Unproved properties
Unproved Oil and Gas Property, Successful Effort Method
Midstream field services property
Midstream Field Services Property
Natural gas gathering systems and treating plants.
Marketing and other
Property, Plant and Equipment, Other, Gross
Total Property, Plant and Equipment
Property, Plant and Equipment, Gross
Less Accumulated Depreciation, Depletion and Amortization
Depreciation, Depletion and Amortization, Nonproduction [Abstract]
Exploration and production
Oil and Gas Property, Successful Effort Method, Accumulated Depreciation, Depletion and Amortization
Midstream field services
Accumulated Depreciation Midstream Field Services
Accumulated depreciation of natural gas gathering systems and treating plants.
Marketing and other
Property, Plant and Equipment, Other, Accumulated Depreciation
Total Accumulated Depreciation, Depletion and Amortization
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Net Property, Plant and Equipment
Property, Plant and Equipment, Net
Investment in unconsolidated affiliates
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
Goodwill
Goodwill
Fair value of derivative contracts
Derivative Instruments and Hedges, Noncurrent
Other noncurrent assets
Other Assets, Noncurrent
TOTAL ASSETS
Current Liabilities
Liabilities, Current [Abstract]
Checks outstanding in excess of cash balances
Bank Overdrafts
Accounts payable and accrued expenses
Accounts Payable and Accrued Liabilities, Current
Production and property taxes
Accrual for Taxes Other than Income Taxes, Current
Interest payable
Interest Payable, Current
Fair value of derivative contracts
Derivative Instruments and Hedges, Liabilities
Deferred income taxes
Deferred Tax Liabilities, Net, Current
Total Current Liabilities
Liabilities, Current
Long-term debt
Long-term Debt, Excluding Current Maturities
Deferred income taxes
Deferred Tax Liabilities, Net, Noncurrent
Asset retirement obligations
Asset Retirement Obligations, Noncurrent
Fair value of derivative contracts
Other long-term liabilities
Other Liabilities, Noncurrent
Commitments and contingencies
Commitments and Contingencies
Common stock - par value $0.01 per share; 500.0 million shares authorized; 178.5 million and 177.2 million shares issued, respectively
Common Stock, Value, Issued
Treasury stock - 0.4 million and 0.4 million shares, respectively
Treasury Stock, Value
Additional paid-in capital
Additional Paid in Capital, Common Stock
Retained earnings
Retained Earnings (Accumulated Deficit)
Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss), Net of Tax
Total Common Shareholders' Equity
Stockholders' Equity Attributable to Parent
Noncontrolling interest
Stockholders' Equity Attributable to Noncontrolling Interest
Total Equity
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
TOTAL LIABILITIES AND EQUITY
Liabilities and Equity
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table]
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table]
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Axis]
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Defined Benefit Plans and Other Postretirement Benefit Plans [Domain]
Defined Benefit Plans and Other Postretirement Benefit Plans [Domain]
Pension [Member]
Pension Plans, Defined Benefit [Member]
Postretirement benefits [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans Funding Type [Axis]
Defined Benefit Plans Funding Type [Axis]
The funding type of defined benefit plan.
Plan Funding Type [Domain]
Plan Funding Type [Domain]
Information on defined benefit plan by funding type.
Funded Pension Plan [Member]
Funded Pension Plan [Member]
Information on funded defined benefit pension plan.
Unfunded Pension Plan [Member]
Unfunded Pension Plan [Member]
Information on unfunded defined benefit pension plan.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions to pension plan
Pension Contributions
Expected to contribute to pension plans
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year
Service cost
Defined Benefit Plan, Service Cost
Interest cost
Defined Benefit Plan, Interest Cost
Expected return on plan assets
Defined Benefit Plan, Expected Return on Plan Assets
Amortization of prior service costs
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)
Amortization of actuarial loss
Defined Benefit Plan, Amortization of Gains (Losses)
Periodic expense
Defined Benefit Plan, Net Periodic Benefit Cost
Schedule of Business Acquisitions, by Acquisition [Table]
Schedule of Business Acquisitions, by Acquisition [Table]
Business Acquisition [Axis]
Business Acquisition [Axis]
Business Acquisition, Acquiree [Domain]
Business Acquisition, Acquiree [Domain]
Business Acquisition [Line Items]
Business Acquisition [Line Items]
Business Combination, Consideration Given [Abstract]
Business Combination, Consideration Transferred [Abstract]
Cash Paid at Closing
Business Acquisition, Cost of Acquired Entity, Cash Paid
Total estimate consideration given
Business Acquisition, Cost of Acquired Entity, Purchase Price
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net [Abstract]
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net [Abstract]
Proved properties
Business Acquisition, Purchase Price Allocation, Mineral Rights
Unproved Properties
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment
Asset retirement obligations
Business Acquisition, Purchase Price Allocation, Liabilities Assumed
Other assets
Business Acquisition, Purchase Price Allocation, Other Assets
Total fair value
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net