Goodwill and Purchased Intangible Assets (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 25, 2011	Jun. 30, 2012	Jun. 25, 2011	Dec. 31, 2011
Goodwill and purchased intangible assets (Textual) [Abstract]
Amortization expenses related to intangible assets	$ 1.0	$ 1.1	$ 2.0	$ 2.5
Unamortized Trade Name	$ 2.2		$ 2.2		$ 2.2