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Derivative Instruments - Summary of Gross and Net Information about Commodity Derivative Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross Amounts of Recognized Assets $ 24,900 $ 155,473
Derivative Assets, Gross Amounts Offset in the Balance Sheet (14,506) 0
Net Amounts of Assets Presented in the Balance Sheet 10,394 155,473
Gross Amounts of Recognized Liabilities 49,688 0
Derivative Liabilities, Gross Amounts Offset in the Balance Sheet (14,506) 0
Net Amounts of Liabilities Presented in the Balance Sheet $ 35,182 $ 0