Derivative Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013	Dec. 31, 2013
Notional Amount of Derivatives, Total [Abstract]
Total outstanding derivative contracts	$ 435,835		$ 435,835		$ 381,393
Foreign currency loss, inclusive of the impact of derivatives	(644)	(638)	(1,597)	(2,164)
Cash Flow Hedges [Member]
Notional Amount of Derivatives, Total [Abstract]
Total outstanding derivative contracts	256,000		256,000		208,446
Balance Sheet Hedges [Member]
Notional Amount of Derivatives, Total [Abstract]
Total outstanding derivative contracts	$ 179,835		$ 179,835		$ 172,947