Derivatives (Details) (USD $) In Thousands	Jul. 01, 2011	Dec. 31, 2010	Jul. 02, 2010
Notional Amount of Derivatives, Total [Abstract]
Notional Amount	$ 198,364	$ 134,767	$ 109,750
Pound Sterling [Member]
Notional Amount of Derivatives, Total [Abstract]
Notional Amount	33,161	23,536	22,814
Euro [Member]
Notional Amount of Derivatives, Total [Abstract]
Notional Amount	135,140	88,414	70,080
Japanese Yen [Member]
Notional Amount of Derivatives, Total [Abstract]
Notional Amount	$ 30,063	$ 22,817	$ 16,856