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Fair Value Measurements and Derivative Instruments (Non-Derivative Net Investment) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Foreign currency debt      
Net investment hedge      
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) $ 20,295 $ 13,210 $ (38,971)