Fair Value Measurements and Financial Instruments - Gains (losses) on Cash Flow Hedges Reported in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax	$ (1,367)	$ 2,253	$ 2,443	$ 3,413
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)	0	0	0	443
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ (1,367)	$ 2,253	$ 2,443	$ 3,856