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Fair Value Measurements and Derivative Instruments - Derivatives Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Derivative Instruments |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ (11,647) | $ 21,776 | $ (41,397) | $ 56,836
Foreign currency forward contracts | Other income (expense) |  |  |  |
Derivative Instruments |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (12,097) | 21,951 | (43,356) | 57,019
Fuel swaps | Other income (expense) |  |  |  |
Derivative Instruments |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (28) | (175) | 155 | (255)
Fuel swaps | Fuel cost |  |  |  |
Derivative Instruments |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ 478 | $ 0 | $ 1,804 | $ 0

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