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Derivative Instruments - Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative instruments — current assets	$ 10,330	$ 139,697
Derivative instruments — non-current assets	64	15,776
Derivative instruments — current liabilities	(20,891)	0
Derivative instruments — non-current liabilities	(14,291)	0
Total derivative instruments	(24,788)
Crude oil [Member]
Derivatives, Fair Value [Line Items]
Derivative instruments — current assets	10,330	139,697
Derivative instruments — non-current assets	64	15,776
Derivative instruments — current liabilities	(20,891)	0
Derivative instruments — non-current liabilities	(14,291)	0
Total derivative instruments	$ (24,788)	$ 155,473

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