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Fair Value Measurements and Derivative Instruments - Derivatives Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Derivative Instruments |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ (37,562) | $ 21,236 | $ (29,750) | $ 34,988
Foreign currency forward contracts | Other income (expense) |  |  |  |
Derivative Instruments |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (36,894) | 21,256 | (31,259) | 35,068
Fuel swaps | Other income (expense) |  |  |  |
Derivative Instruments |  |  |  |
Amount of gain (loss) recognized in income on derivatives | 213 | (20) | 183 | (80)
Fuel swaps | Fuel cost |  |  |  |
Derivative Instruments |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ (881) | $ 0 | $ 1,326 | $ 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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