Shareholders' Equity - Gains and Losses, Net of Tax Reclassified from Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI Into Income	$ (1,527)	$ (2,493)	$ (1,885)	$ (5,996)
Foreign exchange contracts | Other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI Into Income	(2,241)	(2,028)	(3,352)	(5,644)
Foreign exchange contracts | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI Into Income	$ 714	$ (465)	$ 1,467	$ (352)