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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Derivative Instruments |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ (4,067) | $ (37,562) | $ 713 | $ (29,750)
Foreign currency forward contracts | Other income (expense) |  |  |  |
Derivative Instruments |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (4,168) | (36,894) | 846 | (31,259)
Fuel swaps | Other income (expense) |  |  |  |
Derivative Instruments |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (21) | 213 | (119) | 183
Fuel swaps | Fuel cost |  |  |  |
Derivative Instruments |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ 122 | $ (881) | $ (14) | $ 1,326

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