Stockholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 27, 2008
Stockholders' Equity
Shares authorized under share repurchase program	$ 25
Shares of common stock purchased under share repurchase program	1,300,000
Value of shares of common stock purchased under share repurchase program	$ 1.1
Warrants
Number of shares that can be purchased from warrants		1,000,000
Exercise price of warrants (in dollars per share)		$ 3.00