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Leases - Summary of Lease Related Expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Lessee, Lease, Description [Line Items] |  |  |
Amortization of asset | $ 0 | $ 420 |
Interest on lease liabilities | 372 | 202 |
Sublease Income | (1,118) | (1,419) |
Net lease expense | 314,427 | 400,764 |
Variable lease expenses primarily related to additional volumes processed at natural gas processing plant | 21,800 | 28,700 |
Lease operating expenses | 600,076 | 605,180 | $ 353,832
Property, plant and equipment |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease cost | 40,227 | 133,837 |
Lease operating expenses | 25,000 | 102,700 |
Asset retirement obligations |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease cost | 0 | 3,024 |
Lease operating expenses |  | 3,000 |
Lease operating expenses |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease cost | 208,104 | 208,674 |
Lease operating expenses | 73,900 | 56,300 |
Transportation, gathering and processing |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease cost | 39,121 | 41,113 |
Lease operating expenses | 22,900 |  |
Selling and general expense |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease cost | 10,638 | 12,325 |
Lease operating expenses | 3,300 | 4,300 |
Other operating expense |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease cost | 9,524 | 2,588 |
Lease operating expenses | 2,500 | 2,600 |
Impairment of assets |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease cost | 6,565 | 0 |
Exploration Expenses |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease cost | $ 994 | $ 0 |

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- Definition Amount of interest expense on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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- Definition Amount of amortization expense attributable to right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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- Definition Amount of lease cost recognized by lessee for lease contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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