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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Commodity derivatives | Cost of revenue        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-tax gains (losses) $ (4,836) $ (2,842) $ (8,095) $ 843
J. Aron repurchase obligation derivative | Cost of revenue        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-tax gains (losses) (2,638) (4,330) (6,558) 10,812
MLC repurchase obligation derivative | Cost of revenue        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-tax gains (losses) 4,656 0 1,317 0
Interest rate derivatives | Interest expense        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-tax gains (losses) $ (415) $ (21) $ (1,885)  
Interest rate derivatives | Interest income        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-tax gains (losses)       $ 1,277