Stockholders Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	$ 1,380,548	$ 1,346,327	$ 1,441,030	$ 1,428,766	$ 1,346,327	$ 1,428,766
Comprehensive income	2,399	42,368	(109,514)	17,894	44,767	(91,620)
Dividends declared	(8,099)	(8,096)	(8,081)	(8,111)
Common stock repurchases			6,721
Residual interest in subsidiary		(2,381)
Employee stock plans	2,139	2,330	3,380	2,481
Balance at end of period	$ 1,376,987	$ 1,380,548	$ 1,320,094	$ 1,441,030	$ 1,376,987	$ 1,320,094
Dividends declared (in dollars per share)	$ 0.16		$ 0.16
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period (in shares)	64,504	64,481	64,356	64,344	64,481	64,344
Balance at beginning of period	$ 645	$ 645	$ 644	$ 643	$ 645	$ 643
Employee stock plans (in shares)	22	23	23	12
Employee stock plans				$ 1
Balance at end of period (in shares)	64,526	64,504	64,379	64,356	64,526	64,379
Balance at end of period	$ 645	$ 645	$ 644	$ 644	$ 645	$ 644
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	530,075	529,791	519,227	516,562	529,791	516,562
Residual interest in subsidiary		(2,381)
Employee stock plans	2,339	2,665	3,548	2,665
Balance at end of period	$ 532,414	$ 530,075	$ 522,775	$ 519,227	$ 532,414	$ 522,775
Treasury Stock, Common
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period (in shares)	13,897	13,891	13,660	13,658	13,891	13,658
Balance at beginning of period	$ (531,759)	$ (531,507)	$ (523,691)	$ (523,642)	$ (531,507)	$ (523,642)
Common stock repurchases (in shares)			200
Common stock repurchases			$ 6,721
Employee stock plans (in shares)	3	6	3	2
Employee stock plans	$ (124)	$ (252)	$ (106)	$ (49)
Balance at end of period (in shares)	13,900	13,897	13,863	13,660	13,900	13,863
Balance at end of period	$ (531,883)	$ (531,759)	$ (530,518)	$ (523,691)	$ (531,883)	$ (530,518)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	1,572,878	1,567,898	1,599,278	1,587,041	1,567,898	1,587,041
Comprehensive income	17,352	13,159	(39,552)	20,484
Dividends declared	(8,099)	(8,096)	(8,081)	(8,111)
Employee stock plans	(76)	(83)	(62)	(136)
Balance at end of period	1,582,055	1,572,878	1,551,583	1,599,278	1,582,055	1,551,583
Accumulated Other Non-Owner Changes to Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	(191,291)	(220,500)	(154,428)	(151,838)	(220,500)	(151,838)
Comprehensive income	(14,953)	29,209	(69,962)	(2,590)
Balance at end of period	$ (206,244)	$ (191,291)	$ (224,390)	$ (154,428)	$ (206,244)	$ (224,390)