Shareholders' Equity - Gains and Losses, Net of Tax Reclassified from Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Location of Gain (Loss) Reclassified from Accumulated OCI into Income	$ 9,645	$ 1,565
Foreign exchange contracts, net | Other expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Location of Gain (Loss) Reclassified from Accumulated OCI into Income	9,378	1,410
Foreign exchange contracts, net | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Location of Gain (Loss) Reclassified from Accumulated OCI into Income	686	155
Interest rate contracts | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Location of Gain (Loss) Reclassified from Accumulated OCI into Income	(158)	$ 0
Retirement benefit plan activity | Operating expenses
Derivative Instruments, Gain (Loss) [Line Items]
Location of Gain (Loss) Reclassified from Accumulated OCI into Income	$ (261)