Annual report pursuant to Section 13 and 15(d)

Leases (Lease Cost on Consolidated Statement of Operations) (Details)

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Leases (Lease Cost on Consolidated Statement of Operations) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Lease Costs [Line Items]    
Total lease expense $ 26,223 $ 28,793
Lease costs capitalized 147 1,171
Total lease costs 26,370 29,964
Production Expense [Member]    
Lease Costs [Line Items]    
Total lease expense 13,457 7,904
General and Administrative Expense [Member]    
Lease Costs [Line Items]    
Total lease expense 193 197
Lease Costs Billed To Joint Venture Owners [Member]    
Lease Costs [Line Items]    
Total lease expense $ 12,573 $ 20,692