Condensed Consolidated Statements Of Equity Condensed Consolidatd Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock, Common	Additional Paid-in Capital	Retained Earnings	Foreign currency translation adjustments	Defined benefit pension adjustments
Balance (in shares) at Dec. 31, 2019		134,930	(202)
Balance at Dec. 31, 2019	$ 1,165,889	$ 1,349	$ (7,112)	$ 842,784	$ 366,127	$ (36,468)	$ (791)
Shares issued under stock plans (in shares)		483
Shares issued under stock plans	(10,889)	$ 5	0	(10,894)	0	0	0
Share-based compensation expense	4,994	$ 0	0	4,994	0	0	0
Repurchase and retirements of common stock (in shares)		(604)
Repurchase and retirements of common stock	(29,564)	$ (6)	0	(3,740)	(25,818)	0	0
Dividends declared	(10,758)	0	0		(10,773)	0	0
Dividends declared				15
Pension liability adjustments	10	0	0	0	0	0	10
Foreign currency translation adjustments	(9,361)	0	0	0	0	(9,361)	0
Net income	61,006	$ 0	$ 0	0	61,006	0	0
Balance (in shares) at Mar. 28, 2020		134,809	(202)
Balance at Mar. 28, 2020	1,171,327	$ 1,348	$ (7,112)	833,159	390,542	(45,829)	(781)
Balance (in shares) at Dec. 31, 2020		135,149	(202)
Balance at Dec. 31, 2020	1,379,494	$ 1,351	$ (7,112)	844,850	577,833	(36,588)	(840)
Shares issued under stock plans (in shares)		392
Shares issued under stock plans	(13,466)	$ 4	0	(13,470)	0	0	0
Share-based compensation expense	7,138	$ 0	0	7,138	0	0	0
Repurchase and retirements of common stock (in shares)		(145)
Repurchase and retirements of common stock	(15,000)	$ (1)	0	(904)	(14,095)	0	0
Dividends declared	(10,832)	0	0		(10,840)	0	0
Dividends declared				8
Pension liability adjustments	39	0	0	0	0	0	39
Foreign currency translation adjustments	(3,716)	0	0	0	0	(3,716)	0
Net income	84,676	$ 0	$ 0	0	84,676	0	0
Balance (in shares) at Apr. 03, 2021		135,396	(202)
Balance at Apr. 03, 2021	$ 1,428,333	$ 1,354	$ (7,112)	$ 837,622	$ 637,574	$ (40,304)	$ (801)