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Derivatives (Derivatives Gains and Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Not designated as hedging | Cost of sales |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (Losses) on commodity derivatives included in cost of sales and merchandising revenues | $ 4,236 | $ 5,417 | $ (15,012)
Not designated as hedging | Interest rate contract | Interest Expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (Losses) on commodity derivatives included in cost of sales and merchandising revenues | 1,115 | 1,286 |
Not designated as hedging | Foreign Exchange Contract | Other Income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (Losses) on commodity derivatives included in cost of sales and merchandising revenues | (1,548) | 539 |
Designated as Hedging Instrument | Interest rate contract |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest rate derivative gains (losses) included in OCI | (168) | 0 |
Designated as Hedging Instrument | Interest rate contract | Interest Expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest rate derivative gains (losses) included in Interest income (expense) | $ 158 | $ 0 |

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition The effective portion of losses on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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- Definition The net gain (loss) during the reporting period due to ineffectiveness in interest rate cash flow hedges. Recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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