Income Taxes (Schedule of Provision For Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
U.S. Federal									$ 12,913	$ 4,761	$ (587)
State									3,587	791	(2,338)
Foreign									5,178	(386)	4,267
Current, Total									21,678	5,166	1,342
Deferred:
U.S. Federal									(3,052)	(574)	20,930
State									(6,408)	104	2,514
Foreign									292	(916)	1,092
Deferred, Total									(9,168)	(1,386)	24,536
Provision for income taxes	$ 2,531	$ 6,214	$ 3,247	$ 518	$ 1,045	$ (228)	$ 756	$ 2,207	$ 12,510	$ 3,780	$ 25,878