Derivatives and Hedging Activities - Effect of Non-designated Contracts (Details 5) (Foreign Exchange Forward [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Foreign Exchange Forward [Member]
Effect of nondesignated derivative contracts
Gain (loss) on foreign exchange forward contracts including forward point income	$ 1,089	$ (3,194)	$ 3,275	$ 6,465
Gain (loss) from revaluation of foreign currency exposures hedged by foreign exchange forward contracts	$ (1,007)	$ 1,975	$ (2,750)	$ (9,408)