Interest and Other Expense, Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011
Interest and other expense, net
Interest expense	$ (2,041)	$ (2,102)	$ (4,242)	$ (4,202)
Interest and dividend income	42	125	103	291
Derivative gain (loss)	(488)		183
Bank and portfolio asset management fees	(170)	(193)	(334)	(419)
Other income (expense), net	(171)	546	(725)	301
Total	$ (2,828)	$ (1,624)	$ (5,015)	$ (4,029)