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Assets Held for Sale, Divestitures and Acquisitions Assets Held for Sale and Divestitures (Details) - USD ($) $ in Thousands, shares in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 12, 2016 | Oct. 26, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest |  |  |  | $ (64,639) | $ (1,026) | $ (871,303) | $ (185,748) |
Restricted Cash and Cash Equivalents, Noncurrent |  |  |  | 49,000 |  | 49,000 |  | $ 0
Proceeds from Sale of Oil and Gas Property and Equipment |  |  |  |  |  | 201,829 | 335,103 |
Asset retirement obligation associated with oil and gas properties held for sale |  |  |  | 46,290 |  | 46,290 |  | 241
Disposal Group, Including Discontinued Operation, Assets, Current |  |  |  | 1,109,517 |  | $ 1,109,517 |  | 641
Assets Held-for-sale Reasonably Certain Period for Sale |  |  |  |  |  | 1 year |  |
Business Exit Costs |  |  |  | 2,900 |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 18.4 |  |  |  |  |  |
Impairment of Proved Oil and Gas Properties |  |  |  | 8,049 | 55,990 | $ 277,834 | 124,430 | $ 468,700
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | [1] |  |  | $ 20,309 | (15,132) | (289,563) | 55,445 |
Impairment of Proved Oil and Gas Properties |  |  |  |  | 17,800 | 269,600 | 17,800 |
Permian Divestiture 2016 [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  |  |  |  | (10,100) |  |
Proceeds from Sale of Oil and Gas Property and Equipment |  |  |  |  |  | 54,600 |  |
Rocky Mountain Divestiture 2016 [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  |  |  |  | 16,400 |  |
Proceeds from Sale of Oil and Gas Property and Equipment |  |  |  |  |  | $ 110,600 |  |
Mid Continent Divestiture 2015 [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  |  |  |  |  | 108,400 |
Proceeds from Sale of Oil and Gas Property and Equipment |  |  |  |  |  |  | 310,200 |
Business Exit Costs |  |  |  |  | $ 1,000 |  | $ 9,500 |
Subsequent Event [Member] | Raven/Bear Den [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from Sale of Oil and Gas Property and Equipment |  |  | $ 785,000 |  |  |  |  |
[1] | Income (loss) before income taxes reflects oil, gas, and NGL production revenue less oil, gas, and NGL production expense, depletion, depreciation, amortization, and asset retirement obligation liability accretion, and related general and administrative expense and exploration overhead. Additionally, loss before income taxes for the nine months ended September 30, 2016, includes $269.6 million of proved property impairments, and income (loss) before income taxes for the three and nine months ended September 30, 2015, includes $17.8 million of proved property impairment

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- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation for an asset held for sale. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References No definition available. + Details
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