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Derivatives (Derivatives Gains and Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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 | $ (36,563) | $ 1,939 | $ 4,236
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 | (11) | (718) |
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 | 0 | (437) |
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 | 11,497 | 12,398 |
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) | $ (7,982) | $ (761) |

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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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- Definition Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109978405&loc=d3e80720-113993 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 + Details
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