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)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
USD ($)
Lease Costs [Line Items]  
Total lease expense $ 9,327
Lease costs capitalized 1,102
Total lease cost 10,429
Production Expense [Member]  
Lease Costs [Line Items]  
Total lease expense 2,205
General and Administrative Expense [Member]  
Lease Costs [Line Items]  
Total lease expense 49
Lease Costs Billed To Joint Venture Owners [Member]  
Lease Costs [Line Items]  
Total lease expense $ 7,073