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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Total lease expense $ 6,638 $ 17,114
Capital expenditures 99 99
Total lease cost 6,737 17,213
Production Expense [Member]    
Total lease expense 1,979 5,202
General and Administrative Expense [Member]    
Total lease expense 49 147
Lease Costs Billed To Joint Venture Owners [Member]    
Total lease expense $ 4,610 $ 11,765