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)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Total lease costs $ 5,192
Production Expense [Member]  
Total lease costs 1,597
General and Administrative Expense [Member]  
Total lease costs 49
Lease Costs Billed To Joint Venture Owners [Member]  
Total lease costs $ 3,546