Derivatives and Hedging Activities (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Effect of nondesignated derivative contracts
Gain (loss) on foreign exchange contracts including forward point income	$ (3,194)	$ (2,376)	$ 6,465	$ 2,586
Gain (loss) from revaluation of foreign currency exposures hedged by foreign exchange contracts	$ 1,975	$ 2,242	$ (9,408)	$ (1,969)