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Reconciliation of Segment Information, Revenue and Other Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Gain (Loss) on Commodity Derivative Instruments									$ 376,105	$ (30,212)	$ 206,930
Other Operating Income									13,678	26,942	69,182
Total Consolidated Revenue and Other Operating Income	$ 504,747	$ 526,681	$ 602,109	$ 275,234	$ 431,660	$ 393,223	$ 393,590	$ 485,019	1,922,449	1,730,434	1,455,131
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Total Segment Revenue from Contracts with External Customers									$ 1,532,666	$ 1,733,704	$ 1,179,019

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Gain (loss) incurred in hedging activities.

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