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Derivatives - Schedule of Pre-Tax Gain (Loss) Recognized in the Statement of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Commodity derivatives | Cost of revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Cost of revenues $ (3,028) $ 10,940 $ (3,117) $ 13,512
J. Aron repurchase obligation derivative | Cost of revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Cost of revenues (8,300) 0 (20,356) 0
J. Aron repurchase obligation derivative | Interest Expense        
Derivative Instruments, Gain (Loss) [Line Items]        
Cost of revenues $ 1,204 $ 0 $ (1,098) $ 0