Restructuring (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended										3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Mar. 30, 2013 Employee Severance	Mar. 31, 2012 Employee Severance	Mar. 30, 2013 Lease Loss Reserve	Mar. 31, 2012 Lease Loss Reserve	Mar. 30, 2013 Other Restructuring	Mar. 31, 2012 Other Restructuring	Mar. 30, 2013 2012 restructuring plan	Oct. 31, 2012 2012 restructuring plan employee	Mar. 31, 2012 2011 restructuring plan
Restructuring Cost and Reserve [Line Items]
Approximate reduction in headcount										110
Recorded restructuring charges	$ 153	$ 556							$ 200		$ 600
Restructuring Reserve [Roll Forward]
Beginning balance	3,424	1,569	2,373	1,543	793	26	258	0
Restructuring charges	153	650	30	276	19	0	104	374
Cash payments	(2,134)	(1,742)	(1,767)	(1,356)	(196)	(12)	(171)	(374)
Adjustments to prior restructuring costs	0	(94)	0	(80)	0	(14)	0	0
Ending balance	$ 1,443	$ 383	$ 636	$ 383	$ 616	$ 0	$ 191	$ 0