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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, 2017 | Dec. 31, 2016
Derivative instruments disclosure |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | $ 60,819 | $ (52,029)
Foreign exchange contracts | Other income (expense) |  |
Derivative instruments disclosure |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | 61,952 | (51,029)
Fuel contracts | Other income (expense) |  |
Derivative instruments disclosure |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | $ (1,133) | $ (1,000)

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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