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Fair Value Measurements and Derivative Instruments - Derivatives Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Derivative Instruments |  |
Amount of gain (loss) recognized in income on derivatives | $ 7,810 | $ 13,812
Other expense |  |
Derivative Instruments |  |
Amount of gain (loss) recognized in income on derivatives | 7,810 | 13,752
Foreign currency forward contracts | Other expense |  |
Derivative Instruments |  |
Amount of gain (loss) recognized in income on derivatives | 5,635 | 13,812
Fuel swaps | Other expense |  |
Derivative Instruments |  |
Amount of gain (loss) recognized in income on derivatives | (30) | (60)
Fuel swaps | Fuel cost |  |
Derivative Instruments |  |
Amount of gain (loss) recognized in income on derivatives | $ 2,205 | $ 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/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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