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Derivatives - Schedule of Derivatives Fair Value Amounts (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Prepaid Expenses and Other Current Assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Cash collateral $ 200 $ 2,700
Other Noncurrent Assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Cash collateral 7,000 7,000
Commodity Contract | Prepaid Expenses and Other Current Assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) 2,814 0
Commodity Contract | Other Noncurrent Assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) 0 2,748
Commodity Contract | Other Accrued Liabilities    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) (39) (595)
Interest rate derivatives | Prepaid Expenses and Other Current Assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) 1,482 161
Interest rate derivatives | Other Noncurrent Assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) 2,328 3,377
Interest rate derivatives | Other Accrued Liabilities    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) 0 (94)
Over the Counter | J. Aron repurchase obligation derivative | Obligations under Inventory Financing Agreements    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) $ (19,564) $ (20,000)