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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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