Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Income taxes computed at U.S. statutory rate	$ 1,949	$ (4,067)	$ (8,247)
State income taxes	28	(109)	147
Foreign tax rate differential	342	777	479
Change in valuation allowance	1,648	23,894	0
Non-deductible Equity Compensation	311	242	210
Tax credits	(1,834)	(2,187)	(2,103)
Liabilities for uncertain tax positions	74	118	111
Other, net	145	829	(16)
Provision (benefit) for income taxes	$ 2,663	$ 19,497	$ (9,419)