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Fair Value Measurements and Derivative Instruments (Derivatives Not Designated as Hedging Instruments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative instruments disclosure |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivative |  | $ (61,148) | $ 61,704 | $ (45,670)
Foreign exchange contracts | Other income (expense) |  |  |  |
Derivative instruments disclosure |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivative | $ (51,029) | (62,423) | 61,952 |
Fuel contracts | Other income (expense) |  |  |  |
Derivative instruments disclosure |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivative | (1,000) | 114 | (1,133) |
Fuel contracts | Fuel |  |  |  |
Derivative instruments disclosure |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivative | $ 0 | $ 1,161 | $ 0 |

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