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Derivative Instruments - Summary of Gross and Net Information about Commodity Derivative Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross Amounts of Recognized Assets $ 108,205 $ 155,473
Derivative Assets, Gross Amounts Offset in the Balance Sheet (9,094) 0
Net Amounts of Assets Presented in the Balance Sheet 99,111 155,473
Gross Amounts of Recognized Liabilities 11,670 0
Derivative Liabilities, Gross Amounts Offset in the Balance Sheet (9,094) 0
Net Amounts of Liabilities Presented in the Balance Sheet $ 2,576 $ 0