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Derivatives (Pre-tax Gains and Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Commodity | Cost of Sales and Merchandising Revenues |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) on derivatives instruments recognized in earnings | $ 45,844 | $ (41,873) | $ 20,608 | $ (14,848)
Not Designated as Hedging Instrument | Interest rate contracts | Interest Income (Expense) |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) on derivatives instruments recognized in earnings | 351 | (17) | 1,141 | 372
Not Designated as Hedging Instrument | Foreign currency contract | Other Income |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) on derivatives instruments recognized in earnings | (413) | 669 | (1,535) | 767
Designated as Hedging Instrument | Foreign currency contract | Other Income |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) on derivatives instruments recognized in OCI | $ 67 | $ 0 | $ 67 | $ 0

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