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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, 2017 | Dec. 31, 2016
Derivative Instruments |  |
Carrying Value of Non-derivative instrument Designated as hedging instrument | $ 353,493 | $ 311,225
Long Term Debt Current |  |
Derivative Instruments |  |
Carrying Value of Non-derivative instrument Designated as hedging instrument | 66,582 | 61,601
Long-term Debt |  |
Derivative Instruments |  |
Carrying Value of Non-derivative instrument Designated as hedging instrument | $ 286,911 | $ 249,624

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