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Derivatives (Derivatives Gains and Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Interest rate component of debt - not accounted for as a hedge | Cost of sales |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (Losses) on commodity derivatives included in Cost of sales and merchandising revenues | $ 1,939 | $ 4,236 | $ 5,417
Interest rate component of debt - not accounted for as a hedge | Interest rate contract | Interest Expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (Losses) on commodity derivatives included in Cost of sales and merchandising revenues | (718) | 1,115 |
Interest rate component of debt - not accounted for as a hedge | Foreign Exchange Contract | Other Income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (Losses) on commodity derivatives included in Cost of sales and merchandising revenues | (437) | (1,548) |
Interest rate component of debt - accounted for as a hedge | Interest rate contract |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest rate derivative gains (losses) included in Other comprehensive income | 12,398 | 168 |
Interest rate component of debt - accounted for as a hedge | Interest rate contract | Interest Expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest rate derivative gains (losses) included in Interest income (expense) | $ (761) | $ 158 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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