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Fair Value Measurements and Derivative Instruments - Balance Sheet Hedging Instruments (Details) - Foreign currency debt - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Derivative Instruments |  |
Carrying value of non-derivative instrument designated as hedging instrument | $ 298,854 | $ 295,323
Current portion of long-term debt |  |
Derivative Instruments |  |
Carrying value of non-derivative instrument designated as hedging instrument | 79,575 | 70,097
Long-term debt |  |
Derivative Instruments |  |
Carrying value of non-derivative instrument designated as hedging instrument | $ 219,279 | $ 225,226

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