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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, 2017 | Mar. 31, 2016
Derivative Instruments |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | $ 13,812 | $ 14,455
Other expense |  |
Derivative Instruments |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | 13,752 | 14,477
Foreign currency forward contracts | Other expense |  |
Derivative Instruments |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | 13,812 | 14,455
Fuel swaps | Other expense |  |
Derivative Instruments |  |
Amount of Gain (Loss) Recognized in Income on Derivatives | $ (60) | $ 22

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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=64837297&loc=SL5624171-113959 + Details
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