Derivatives - Schedule of Derivatives Fair Value Amounts (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Prepaid Expenses and Other Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Cash collateral	$ 2,700	$ 200
Other Noncurrent Assets
Derivative Instruments, Gain (Loss) [Line Items]
Cash collateral	8,300	7,000
Commodity Contract | Prepaid Expenses and Other Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Asset (Liability)	4,973	2,814
Commodity Contract | Other Accrued Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Asset (Liability)	(700)	(39)
Interest rate derivatives | Prepaid Expenses and Other Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Asset (Liability)	191	1,482
Interest rate derivatives | Other Noncurrent Assets
Derivative Instruments, Gain (Loss) [Line Items]
Asset (Liability)	0	2,328
Over the Counter | J. Aron repurchase obligation derivative | Obligations under Inventory Financing Agreements
Derivative Instruments, Gain (Loss) [Line Items]
Asset (Liability)	$ 4,085	$ (19,564)