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Fair Value Measurements and Derivative Instruments (Non-Derivative Instruments) (Details) - Foreign currency debt $ in Thousands, € in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 EUR (€)
Net investment hedge |  |  |  |
Carrying Value of Non-derivative instrument Designated as hedging instrument | $ 320,152 |  | $ 295,323 |
Pullmantur and TUI Cruises |  |  |  |
Net investment hedge |  |  |  |
Carrying Value of Non-derivative instrument Designated as hedging instrument | 320,200 | € 280.0 | 295,300 | € 246.0
Current portion of long-term debt |  |  |  |
Net investment hedge |  |  |  |
Carrying Value of Non-derivative instrument Designated as hedging instrument | 38,168 |  | 70,097 |
Long-term debt |  |  |  |
Net investment hedge |  |  |  |
Carrying Value of Non-derivative instrument Designated as hedging instrument | $ 281,984 |  | $ 225,226 |

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