Summary of Significant Accounting Policies Accounts Receivable (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Accounting Policies [Abstract]
Allowance for Doubtful Accounts Receivable, Period Start		$ (265)	$ (247)	$ (243)
Additions for Doubtful Accounts	[1]	(191)	(174)	(307)
Allowance for Doubtful Accounts Receivable, Write-offs	[2]	188	156	303
Allowance for Doubtful Accounts Receivable, Period End		$ (268)	$ (265)	$ (247)

[1] Allowance for doubtful accounts are charged to expenses.

[2] Represents uncollectible accounts written off against the allowance for doubtful accounts.