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Derivatives - Fair Value Amounts of Derivatives and Placement in Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Prepaid and other current assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Cash collateral $ 3,000 $ 200
Other long-term assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Cash collateral 7,000 7,000
Commodity derivatives | Prepaid and other current assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) 0 2,814
Commodity derivatives | Other accrued liabilities    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) (2,073) (39)
J. Aron repurchase obligation derivative | Over the Counter | Obligations under Inventory Financing Agreements    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) (8,752) (19,564)
Interest rate derivatives | Prepaid and other current assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) 554 1,482
Interest rate derivatives | Other long-term assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) $ 0 $ 2,328