Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Lease Cost on Consolidated Statement of Operations) (Details)

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Commitments and Contingencies (Lease Cost on Consolidated Statement of Operations) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Total lease costs $ 5,284 $ 10,476
Production Expense [Member]    
Total lease costs 1,626 3,223
General and Administrative Expense [Member]    
Total lease costs 49 98
Lease Costs Billed To Joint Venture Owners [Member]    
Total lease costs $ 3,609 $ 7,155