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Leases (Lease Cost on Consolidated Statement of Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Lease Costs [Line Items] |  |
Total lease expense | $ 6,618 | $ 9,327
Lease costs capitalized |  | 1,102
Total lease costs | 6,618 | 10,429
Production Expense [Member] |  |
Lease Costs [Line Items] |  |
Total lease expense | 2,649 | 2,205
General and Administrative Expense [Member] |  |
Lease Costs [Line Items] |  |
Total lease expense | 49 | 49
Lease Costs Billed To Joint Venture Owners [Member] |  |
Lease Costs [Line Items] |  |
Total lease expense | $ 3,920 | $ 7,073

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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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