Stockholders' Equity and Stock-Based Compensation Nonemployee Director Restricted Stock and Restricted Stock Unit Awards (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Mar. 09, 2006
Director Restricted Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock available for grant per employee	$ 110	$ 90	$ 60
Repurchase price per share			$ 0.01
Restricted stock subject to restrictions percent			100.00%
Director Restricted Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Award Termination Period	10 years