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Segment Information Reconciliation of Segment Information, Revenue and Other Operating Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue, Major Customer [Line Items] |  |  |  |
Gain on Commodity Derivative Instruments | $ 25,660 | $ 83,788 | $ 60,747 | $ 61,325
Other Operating Income | 8,534 | 16,658 | 19,244 | 32,308
Total Revenue | 402,124 | 371,068 | 897,853 | 690,996
Operating Segments [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Total Segment Revenue from Contracts with External Customers | $ 367,930 | $ 270,622 | $ 817,862 | $ 597,363

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