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Derivative Instruments - Impact of Netting Agreements and Margin Deposits (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Asset derivatives:
Derivative instruments, recorded in the Condensed Consolidated Balance Sheet, gross	$ 136,591	$ 417,397
Liability derivatives:
Derivative instruments, recorded in the Condensed Consolidated Balance Sheet, gross	110,960	23,434
Commodity derivatives
Asset derivatives:
Derivative instruments, recorded in the Condensed Consolidated Balance Sheet, gross	136,591	417,397
Derivative instruments subject to master netting agreements	(70,234)	(19,909)
Margin deposits remitted to counterparties	0	0
Derivative instruments, net	66,357	397,488
Liability derivatives:
Derivative instruments, recorded in the Condensed Consolidated Balance Sheet, gross	110,960	23,434
Derivative instruments subject to master netting agreements	(70,234)	(19,909)
Margin deposits remitted to counterparties	0	0
Derivative instruments, net	$ 40,726	$ 3,525

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