Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Retained Earnings	Accumulated Other Non-Owner Changes to Equity
Balance (in shares) at Dec. 31, 2018		63,367,000		12,034,000
Balance at Dec. 31, 2018	$ 1,203,056	$ 634	$ 470,818	$ (441,668)	$ 1,363,772	$ (190,500)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	138,355				158,350	(19,995)
Dividends declared	(32,544)				(32,544)
Common stock repurchases (in shares)				900,000
Common stock repurchases	(50,347)			$ (50,347)
Employee stock plans (in shares)		506,000		117,000
Employee stock plans	12,008	$ 5	18,464	$ (6,059)	(402)
Balance (in shares) at Dec. 31, 2019		63,873,000		13,051,000
Balance at Dec. 31, 2019	1,270,528	$ 639	489,282	$ (498,074)	1,489,176	(210,495)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	151,555				63,375	88,180
Dividends declared	(32,402)				(32,402)
Common stock repurchases (in shares)				396,000
Common stock repurchases	(15,550)			$ (15,550)
Employee stock plans (in shares)		298,000		83,000
Employee stock plans	8,546	$ 3	12,249	$ (3,368)	(338)
Balance (in shares) at Dec. 31, 2020		64,171,000		13,530,000
Balance at Dec. 31, 2020	1,382,677	$ 642	501,531	$ (516,992)	1,519,811	(122,315)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	70,350				99,873	(29,523)
Dividends declared	(32,402)				(32,402)
Residual interest in subsidiary	2,177		2,177
Common stock repurchases (in shares)				100,000
Common stock repurchases	(5,229)			$ (5,229)
Employee stock plans (in shares)		173,000		28,000
Employee stock plans	11,193	$ 1	12,854	$ (1,421)	(241)
Balance (in shares) at Dec. 31, 2021		64,344,000		13,658,000
Balance at Dec. 31, 2021	$ 1,428,766	$ 643	$ 516,562	$ (523,642)	$ 1,587,041	$ (151,838)