Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 17, 2014	Dec. 31, 2013
Consolidated Balance Sheets [Abstract]
Accumulated depreciation	$ (51,035)	$ (45,296)
Preferred stock, par value per share	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value per share	$ 0.001	$ 0.001
Common stock, shares authorized	190,000,000	190,000,000
Common stock, shares issued	23,629,642	23,626,642
Common stock, shares outstanding	23,541,267	23,626,642
Treasury stock, shares	300,000	196,500