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Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Income Tax Disclosure [Abstract]
Provision for Income Taxes at Statutory Rate	$ 15,592	$ 17,279	$ 14,531
Increases (Decreases) Resulting From:
State income taxes, net of federal tax	189	506	694
U.S. tax cost of foreign earnings	192	455	206
Foreign tax rate differential	(3,921)	(3,852)	(3,026)
(Reversal of) provision for tax benefit reserves, net	(76)	33	(1,017)
Change in valuation allowance	(131)	99	125
Nondeductible expenses	1,090	704	1,398
Research and development tax credits	(229)	(210)	(274)
Excess tax benefit related to share-based compensation	(553)	0	0
Other	(70)	(252)	(190)
Continuing Operations	$ 12,083	$ 14,762	$ 12,447

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