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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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