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Acquisitions, Divestitures, and Assets Held for Sale Divestitures and Assets Held for Sale (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash received on divestiture of non-strategic assets |  |  | $ 357,938,000 | $ 43,858,000 | $ 424,849,000
Net gain on divestiture activity |  |  | 43,031,000 | 646,000 | 27,974,000
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down |  |  | 98,600,000 | 27,600,000 |
Contractual Obligation | [1] |  | $ 964,438,000 |  |
Assets Held-for-sale, Current |  |  |  |  |
Reasonably certain period within which sale will take place (in years) |  |  | 1 year |  |
Oil and gas properties held for sale |  |  | $ 641,000 | 17,891,000 |
Asset Retirement Obligations Assets Held-for-sale Noncurrent |  |  | 241,000 |  |
Mid Continent Divestiture 2015 [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash received on divestiture of non-strategic assets |  |  | 316,800,000 |  |
Net gain on divestiture activity |  |  | 108,400,000 |  |
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down |  | $ 30,000,000 |  |  |
Business Exit Costs |  |  | 9,300,000 |  |
Permian Divestiture 2015 [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash received on divestiture of non-strategic assets |  |  | 25,100,000 |  |
Net gain on divestiture activity |  |  | 2,400,000 |  |
Other Divestitures 2015 [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down |  |  | 68,600,000 |  |
Rocky Mountain Divestiture 2014 [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash received on divestiture of non-strategic assets |  |  |  | 50,100,000 |
Net gain on divestiture activity |  |  |  | $ 26,900,000 |
Mid Continent Divestiture 2013 [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash received on divestiture of non-strategic assets |  |  |  |  | 368,500,000
Net gain on divestiture activity |  |  |  |  | 25,300,000
Rocky Mountain Divestiture 2013 [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash received on divestiture of non-strategic assets |  |  |  |  | 57,100,000
Net gain on divestiture activity |  |  |  |  | 13,200,000
Permian Divestiture 2013 [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash received on divestiture of non-strategic assets |  |  |  |  | 14,000,000
Net gain on divestiture activity |  |  |  |  | $ (7,000,000)
Office Space Leases [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Contractual Obligation |  |  | 59,400,000 |  |
Office Space Leases [Member] | Mid Continent Divestiture 2015 [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Contractual Obligation |  |  | $ 4,000,000 |  |
[1] | During the third quarter of 2015, the Company vacated its office space in Tulsa, Oklahoma. These amounts include lease payments for the Tulsa office, net of sublease income. The Company expects to receive $3.5 million of sublease income as follows: $831,000 in 2016, $953,000 in 2017, $978,000 in 2018, and $741,000 in 2019.

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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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