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Derivatives - Fair Value Amounts of Derivatives and Placement in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Prepaid and other current assets |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Cash collateral | $ 4,100 | $ 2,700
Other current assets |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Cash collateral | 9,500 | 8,300
Commodity derivatives | Prepaid and other current assets |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Asset (Liability) | 118 | 4,973
Commodity derivatives | Other accrued liabilities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Asset (Liability) | (110) | (700)
J. Aron repurchase obligation derivative | Over the Counter | Obligations under inventory financing agreements |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Asset (Liability) | (2,473) | 4,085
MLC repurchase obligation derivative | Over the Counter | Obligations under inventory financing agreements |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Asset (Liability) | 4,340 | 0
Interest rate derivatives | Prepaid and other current assets |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Asset (Liability) | 0 | 191
Interest rate derivatives | Other accrued liabilities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Asset (Liability) | (315) | 0
Interest rate derivatives | Other liabilities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Asset (Liability) | $ (1,557) | $ 0

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