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Commitments (Details) Bcf in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) MMBbls Bcf | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Commitments and Contingencies |  |  |
Contractual obligation, due in next fiscal year | $ 132,502 |  |
Contractual obligation, due in second year | 103,169 |  |
Contractual obligation, due in third year | 88,785 |  |
Contractual obligation, due in fourth year | 70,741 |  |
Contractual obligation, due in fifth year | 37,334 |  |
Contractual obligation, due after fifth year | 24,931 |  |
Contractual obligation | 457,462 |  |
Minimum [Member] |  |  |
Commitments and Contingencies |  |  |
Potential Penalty for not Meeting Minimum Drilling and Completion Requirements | 0 |  |
Maximum [Member] |  |  |
Commitments and Contingencies |  |  |
Potential Penalty for not Meeting Minimum Drilling and Completion Requirements | $ 60,000 |  |
Crude oil pipeline commitment [Member] |  |  |
Commitments and Contingencies |  |  |
Oil and gas delivery commitments, remaining minimum contractual volumes | MMBbls | 29 |  |
Natural gas pipeline commitment [Member] |  |  |
Commitments and Contingencies |  |  |
Oil and gas delivery commitments, remaining minimum contractual volumes | Bcf | 595 |  |
Crude Oil Pipeline Commitment Excluded from Remaining Deficiency Payment Amount [Member] |  |  |
Commitments and Contingencies |  |  |
Oil and gas delivery commitments, remaining minimum contractual volumes | MMBbls | 18.6 |  |
Drilling rig leasing contracts [Member] |  |  |
Commitments and Contingencies |  |  |
Contractual obligation | $ 86,900 |  |
Early Termination Penalty for Rig Contract Cancellation | 45,900 |  |
Expenses related to early contract termination | 0 | $ 0 | $ 8,700
Pipeline transportation commitments [Member] |  |  |
Commitments and Contingencies |  |  |
Contractual obligation | 287,800 |  |
Office space leases [Member] |  |  |
Commitments and Contingencies |  |  |
Contractual obligation | 35,500 |  |
Expenses related to early contract termination | 1,300 |  | 3,200
Operating leases, rent expense, net of sublease income | 4,500 | $ 4,800 | $ 5,200
Other miscellaneous contracts and leases [Member] |  |  |
Commitments and Contingencies |  |  |
Contractual obligation | 18,300 |  |
Electricity purchase agreement [Member] |  |  |
Commitments and Contingencies |  |  |
Contractual obligation | $ 29,000 |  |
Water pipeline commitment [Member] |  |  |
Commitments and Contingencies |  |  |
Water delivery commitments, remaining minimum contractual volumes | MMBbls | 21 |  |

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- Definition Total amount of water committed to be supplied under existing contracts or agreements. + References No definition available. + Details
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- Definition Amount of contractual obligation due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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