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Fair Value Measurements and Derivative Instruments (Derivatives Not Designated as Hedging Instruments) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative instruments disclosure |  |  |
Amount of Gain (Loss) Recognized in Income on Derivative | $ 1,431 | $ (61,148) | $ 61,704
Foreign exchange contracts | Other income (expense) |  |  |
Derivative instruments disclosure |  |  |
Amount of Gain (Loss) Recognized in Income on Derivative | 1,356 | (62,423) | 61,952
Fuel contracts | Other income (expense) |  |  |
Derivative instruments disclosure |  |  |
Amount of Gain (Loss) Recognized in Income on Derivative | 112 | 114 | (1,133)
Fuel contracts | Fuel |  |  |
Derivative instruments disclosure |  |  |
Amount of Gain (Loss) Recognized in Income on Derivative | $ (37) | $ 1,161 | $ 0

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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