Income Taxes (Details Textual) (USD $)	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Income Taxes (Textual) [Abstract]
Income tax benefit	$ 4,182,000	$ (2,011,000)
Income tax provision		2,000,000
Research tax credit	500,000
Anticipated increase in unrecognized tax benefits in the next twelve months	$ 500,000