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Derivative Instruments - Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Derivative instruments — current assets $ 91,590 $ 139,697
Derivative instruments — non-current assets 7,521 15,776
Derivative instruments — current liabilities (1,018) 0
Derivative instruments — non-current liabilities (1,558) 0
Total derivative instruments 96,535  
Crude oil [Member]    
Derivatives, Fair Value [Line Items]    
Derivative instruments — current assets 91,590 139,697
Derivative instruments — non-current assets 7,521 15,776
Derivative instruments — current liabilities (1,018) 0
Derivative instruments — non-current liabilities (1,558) 0
Total derivative instruments $ 96,535 $ 155,473