Description of Business and Summary of Significant Accounting Policies Recently Issued Accounting Guidance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Statement of Cash Flows [Abstract]
Restricted Cash and Investments, Current	$ 151	$ 112	$ 268
Cash and cash equivalents	63,170	67,200	61,023
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	63,321	$ 67,312	$ 61,291	$ 50,654
Assets [Member] | Minimum [Member]
Statement of Cash Flows [Abstract]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	520,000
Assets [Member] | Maximum [Member]
Statement of Cash Flows [Abstract]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	620,000
Liability [Member] | Minimum [Member]
Statement of Cash Flows [Abstract]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	550,000
Liability [Member] | Maximum [Member]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	$ 650,000