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Leases (Lease Cost on Consolidated Statement of Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Lease Costs [Line Items] |  |  |  |
Total lease expense | $ 6,566 | $ 6,011 | $ 13,184 | $ 15,338
Lease costs capitalized |  | 59 |  | 1,161
Total lease costs | 6,566 | 6,070 | 13,184 | 16,499
Production Expense [Member] |  |  |  |
Lease Costs [Line Items] |  |  |  |
Total lease expense | 3,852 | 1,814 | 6,501 | 4,019
General and Administrative Expense [Member] |  |  |  |
Lease Costs [Line Items] |  |  |  |
Total lease expense | 47 | 49 | 96 | 98
Lease Costs Billed To The Joint Venture Owners [Member] |  |  |  |
Lease Costs [Line Items] |  |  |  |
Total lease expense | $ 2,667 | $ 4,148 | $ 6,587 | $ 11,221

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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=121609121&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=121568110&loc=SL77918982-209971 + Details
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