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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Income Tax Disclosure [Abstract]
Federal statutory tax expense	$ 24,678	$ 45,098	$ 55,020
State taxes, net of federal tax effect	2,197	3,874	4,269
Credit for increasing research activities	(3,407)	(3,808)	(3,320)
Deduction related to domestic production activities	(1,537)	(2,243)	(3,320)
Valuation allowance	4,232	231	565
Federal rate adjustment to deferred taxes	(45,386)	0	0
Equity based compensation	(1,544)	0	0
Change in uncertain tax positions	(163)	117	(1,344)
Foreign income tax rate differential	2,094	845	1,074
Other – net	(450)	(841)	(1,180)
Total income tax expense	$ (19,286)	$ 43,273	$ 51,764

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Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount

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