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Fair Value Measurements and Derivative Instruments - Balance Sheet Hedging Instruments (Details) - Foreign currency debt - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Derivative Instruments |  |
Carrying value of non-derivative instrument designated as hedging instrument | $ 313,205 | $ 320,152
Current portion of debt |  |
Derivative Instruments |  |
Carrying value of non-derivative instrument designated as hedging instrument | 73,536 | 38,168
Long-term debt |  |
Derivative Instruments |  |
Carrying value of non-derivative instrument designated as hedging instrument | $ 239,669 | $ 281,984

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- Definition Nominal or face amount used to calculate payments on a nonderivative instrument. + References No definition available. + Details
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