Quarterly report pursuant to Section 13 or 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
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Lease Costs [Line Items]    
Total lease expense $ 6,895 $ 6,618
Lease costs capitalized 491  
Total lease costs 7,386 6,618
Finance Lease Cost [Member]    
Lease Costs [Line Items]    
Total lease expense 39  
Production Expense [Member]    
Lease Costs [Line Items]    
Total lease expense 3,838 2,649
General and Administrative Expense [Member]    
Lease Costs [Line Items]    
Total lease expense 16 49
Lease Costs Billed To Joint Venture Owners [Member]    
Lease Costs [Line Items]    
Total lease expense $ 3,002 $ 3,920