Shareholders' Equity Gains and Losses, Net of Tax Reclassified from Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI Into Income	$ 823	$ 1,359
Foreign Exchange Contract | Other expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI Into Income	1,227	1,930
Foreign Exchange Contract | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI Into Income	$ (404)	$ (571)