Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Income Tax Disclosure [Abstract]
Provision for Income Taxes at Statutory Rate	$ 20,179	$ 15,592	$ 17,279
Increases (Decreases) Resulting From:
State income taxes, net of federal tax	151	189	506
U.S. tax cost of foreign earnings	761	192	455
Foreign tax rate differential	(3,747)	(3,921)	(3,852)
Provision for (reversal of) tax benefit reserves, net	1,517	(76)	33
Change in valuation allowance	(341)	(131)	99
Nondeductible expenses	1,177	1,090	704
Research and development tax credits	(297)	(229)	(210)
Excess tax benefit related to share-based compensation	(581)	(553)	0
Impact of the U.S. Tax Cuts and Jobs Act	7,093	0	0
Other	158	(70)	(252)
Continuing Operations	$ 26,070	$ 12,083	$ 14,762