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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

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