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Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Provision for Income Taxes at Statutory Rate (21% in 2018 and 35% in 2017 and 2016)	$ 16,701	$ 20,179	$ 15,592
Increases (Decreases) Resulting From:
State income taxes, net of federal tax	164	151	189
U.S. tax cost of foreign earnings	1,215	761	192
Foreign tax rate differential	3,158	(3,747)	(3,921)
(Reversal of) provision for tax benefit reserves, net	(1,785)	1,517	(76)
Change in valuation allowance	141	(341)	(131)
Nondeductible expenses	781	1,177	1,090
Research and development tax credits	(445)	(297)	(229)
Excess tax benefit related to stock-based compensation	(967)	(581)	(553)
Impact of the U.S. Tax Cuts and Jobs Act	(106)	7,093	0
Other	(375)	158	(70)
Continuing Operations	$ 18,482	$ 26,070	$ 12,083

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