Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Apr. 02, 2011	Jan. 01, 2011
Components of accumulated other comprehensive income
Foreign currency translation adjustments	$ 41,012	$ 21,356	$ 74,236
Actuarial losses related to post retirement medical plans, net of tax of $1,232 as of March 31, 2012, December 31, 2011 and April 2, 2011	(1,299)	(1,299)	(1,099)
(Loss) on cash flow hedges, net of taxes of $3,577, $2,930 and $1,340 as of March 31, 2012, December 31, 2011 and April 2, 2011, respectively	(5,645)	(3,937)	(3,530)	(2,331)
Other	111	122	11
Total accumulated other comprehensive income	$ 34,179	$ 16,242	$ 69,618