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Leases (Summary of Lease Related Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Lessee, Lease, Description [Line Items] |  |  |  |
Interest on lease liabilities | $ 86 | $ 92 | $ 172 | $ 188
Sublease income | (662) | (336) | (958) | (642)
Net lease expense | 89,073 | 89,636 | 154,854 | 199,392
Variable lease expense | 8,200 | 6,000 | 13,500 | 12,300
Lease operating expense | 126,413 | 144,644 | 273,577 | 353,792
Property, plant and equipment |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease | 26,738 | 13,104 | 31,634 | 37,660
Lease operating expense | 10,000 | 7,500 | 14,900 | 22,900
Lease operating expenses |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease | 48,049 | 53,588 | 94,133 | 125,189
Lease operating expense | 11,100 | 21,400 | 23,500 | 54,300
Transportation, gathering and processing |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease | 9,982 | 9,137 | 19,758 | 19,063
Lease operating expense | 7,600 | 6,600 | 14,900 | 8,000
Selling and general expense |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease | 2,453 | 3,281 | 5,273 | 6,750
Lease operating expense | 500 | 1,000 | 1,300 | 2,200
Other operating expense |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease | 2,427 | 4,201 | 4,842 | 4,615
Lease operating expense |  |  |  | 2,400
Impairment of assets |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease | $ 0 | $ 6,555 | $ 0 | $ 6,555

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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=123408670&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=123391704&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=123414884&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=123408670&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=123414884&loc=SL77918982-209971 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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=123414884&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=123408670&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=123408670&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=123414884&loc=SL77918982-209971 + Details
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