Income Taxes (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Income Tax Disclosure [Abstract]
Income tax provision (benefit)	$ 17,919,000	$ (3,133,000)	$ 18,494,000	$ (9,727,000)
Increase in valuation allowance for deferred tax assets	21,100,000
Research tax credit				600,000
Anticipated increase in unrecognized tax benefits in the next twelve months	$ 200,000		$ 200,000