Description of Business and Summary of Significant Accounting Policies (Details 3) - USD ($) $ in Thousands	Dec. 29, 2016	Dec. 31, 2015
Summary of Significant Accounting Policies [Line Items]
Unrealized gain (loss) on available for sale investments	$ 3	$ (11)
Unrecognized gain on interest rate swap agreement	0	9
Net unrecognized actuarial loss for pension obligation	(5,069)	(5,219)
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (5,066)	$ (5,221)