Derivatives and Hedging Instruments Derivatives and Hedging Instruments - Summary of Effects of Derivatives on Cash Flow Hedging Relationships in Company's Statements of Income, Derivatives Not Designated as Hedging Instruments (Details) - Not Designated as Hedging Instruments - Cash Flow Hedges - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other (expense) income | Foreign currency exchange contracts
Derivative [Line Items]
Amount of Derivative Gain (Loss) Recognized in Income	$ (9,221)	$ 1,755	$ 8,248
Interest expense | Interest rate cap contracts
Derivative [Line Items]
Amount of Derivative Gain (Loss) Recognized in Income	(1,568)	2,026	0
Interest expense | Interest rate swap agreements
Derivative [Line Items]
Amount of Derivative Gain (Loss) Recognized in Income	$ 0	$ 110	$ 144