Income Taxes Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014	Dec. 28, 2014
Income Tax Examination [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 3,900		$ 3,900		$ 3,900
Income Tax Expense (Benefit)	2,669	$ (321)	6,108	$ 6,539
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 1,000		$ 1,000