Stockholders Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	$ 1,346,327	$ 1,428,766
Comprehensive income	42,368	17,894
Dividends declared	(8,096)	(8,111)
Residual interest in subsidiary	(2,381)
Employee stock plans	2,330	2,481
Balance at end of period	$ 1,380,548	$ 1,441,030
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)	64,481	64,344
Balance at beginning of period	$ 645	$ 643
Employee stock plans (in shares)	23	12
Employee stock plans	$ 0
Balance at end of period (in shares)	64,504	64,356
Balance at end of period	$ 645	$ 644
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	529,791	516,562
Residual interest in subsidiary	(2,381)
Employee stock plans	2,665	2,665
Balance at end of period	$ 530,075	$ 519,227
Treasury Stock, Common
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period (in shares)	13,891	13,658
Balance at beginning of period	$ (531,507)	$ (523,642)
Employee stock plans (in shares)	6	2
Employee stock plans	$ (252)		$ (49)
Balance at end of period (in shares)	13,897	13,660
Balance at end of period	$ (531,759)	$ (523,691)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	1,567,898	1,587,041
Comprehensive income	13,159	20,484
Dividends declared	(8,096)	(8,111)
Employee stock plans	(83)	(136)
Balance at end of period	1,572,878	1,599,278
Accumulated Other Non-Owner Changes to Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	(220,500)	(151,838)
Comprehensive income	29,209	(2,590)
Balance at end of period	$ (191,291)	$ (154,428)