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Derivative Instruments - Commodity Derivative Gross and Net Information (Details) - Commodity derivative instruments - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Offsetting Assets [Line Items]
Derivative assets, gross amounts of recognized assets	$ 155,473	$ 331,121
Derivative assets, gross amounts offset in the balance sheet	0	(15,614)
Derivative assets	155,473	315,507
Derivative liabilities, gross amounts of recognized liabilities	0	15,614
Derivative liabilities, gross amounts offset in the balance sheet	0	(15,614)
Derivative liabilities	$ 0	$ 0

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