Stockholders Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	$ 1,428,766	$ 1,382,677
Comprehensive income	17,894	(25,520)
Dividends declared	(8,111)	(8,104)
Employee stock plans	2,481	2,314
Balance at end of period	$ 1,441,030	$ 1,351,367
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)	64,344	64,171
Balance at beginning of period	$ 643	$ 642
Employee stock plans (in shares)	12	12
Employee stock plans	$ 1	$ 0
Balance at end of period (in shares)	64,356	64,183
Balance at end of period	$ 644	$ 642
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	516,562	501,531
Employee stock plans	2,665	2,406
Balance at end of period	$ 519,227	$ 503,937
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period (in shares)	13,658	13,530
Balance at beginning of period	$ (523,642)	$ (516,992)
Employee stock plans (in shares)	2	1
Employee stock plans	$ (49)	$ (68)
Balance at end of period (in shares)	13,660	13,531
Balance at end of period	$ (523,691)	$ (517,060)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	1,587,041	1,519,811
Comprehensive income	20,484	19,382
Dividends declared	(8,111)	(8,104)
Employee stock plans	(136)	(24)
Balance at end of period	1,599,278	1,531,065
Accumulated Other Non-Owner Changes to Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	(151,838)	(122,315)
Comprehensive income	(2,590)	(44,902)
Balance at end of period	$ (154,428)	$ (167,217)