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Derivative Instruments - Summary of Gross and Net Information about Commodity Derivative Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross Amounts of Recognized Assets	$ 23,713	$ 155,473
Derivative Assets, Gross Amounts Offset in the Balance Sheet	(14,377)	0
Net Amounts of Assets Presented in the Balance Sheet	9,336	155,473
Gross Amounts of Recognized Liabilities	39,440	0
Derivative Liabilities, Gross Amounts Offset in the Balance Sheet	(14,377)	0
Net Amounts of Liabilities Presented in the Balance Sheet	$ 25,063	$ 0

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