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Leases (Lease Cost on Consolidated Statement of Operations) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Lease Costs [Line Items] |  |
Total lease expense | $ 28,793 | $ 28,236
Lease costs capitalized | 1,171 | 1,134
Total lease costs | 29,964 | 29,370
Production Expense [Member] |  |
Lease Costs [Line Items] |  |
Total lease expense | 7,904 | 7,859
General and Administrative Expense [Member] |  |
Lease Costs [Line Items] |  |
Total lease expense | 197 | 196
Lease Costs Billed To Joint Venture Owners [Member] |  |
Lease Costs [Line Items] |  |
Total lease expense | $ 20,692 | $ 20,181

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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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