Derivative Instruments - Effect on Income Statement (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency loss, inclusive of the impact of derivatives	$ (927)	$ (863)	$ (1,526)	$ (3,045)
Foreign Exchange Contract [Member] | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in AOCI (effective portion)	(1,131)	6,583	(2,930)	5,368
Foreign Exchange Contract [Member] | Cost of Sales [Member] | Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Reclassified from AOCI into cost of sales (effective portion)	(283)	(1,122)	(580)	(1,392)
Foreign Exchange Contract [Member] | Other Income Expense Net [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in other, net	2,324	(4,457)	3,091	(3,631)
Foreign Exchange Contract [Member] | Other Income Expense Net [Member] | Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in other, net (ineffective portion and amount excluded from effectiveness testing)	$ (21)	$ (21)	$ (46)	$ 13