Consolidated Statements of Changes in Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Capital In Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2022		134,162,000
Beginning balance at Dec. 31, 2022	$ 1,953,824	$ 1,342	$ 1,307,162	$ 694,287	$ (48,967)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	341,527			341,527
Other comprehensive (loss) income	(1,568)				(1,568)
Purchase and retirement of common stock (in shares)		(4,050,000)
Purchase and retirement of common stock	(241,848)	$ (41)	(26,800)	(215,007)
Issuance of common stock under employee stock purchase plan (in shares)		65,000
Issuance of common stock under employee stock purchase plan	3,317	$ 1	3,316
Issuance of common stock under share-based award plans (in shares)		1,394,000
Issuance of common stock under share-based award plans	62,343	$ 14	62,329
Stock-based compensation	23,458		23,458
Dividends declared	(57,177)			(57,177)
Other	5			5
Ending balance (in shares) at Sep. 30, 2023		131,571,000
Ending balance at Sep. 30, 2023	2,083,881	$ 1,316	1,369,465	763,635	(50,535)
Beginning balance (in shares) at Jun. 30, 2023		132,230,000
Beginning balance at Jun. 30, 2023	2,023,553	$ 1,322	1,337,538	724,672	(39,979)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	115,661			115,661
Other comprehensive (loss) income	(10,556)				(10,556)
Purchase and retirement of common stock (in shares)		(1,399,000)
Purchase and retirement of common stock	(85,979)	$ (14)	(9,262)	(76,703)
Issuance of common stock under employee stock purchase plan (in shares)		20,000
Issuance of common stock under employee stock purchase plan	1,073	$ 1	1,072
Issuance of common stock under share-based award plans (in shares)		720,000
Issuance of common stock under share-based award plans	32,145	$ 7	32,138
Stock-based compensation	7,979		7,979
Other	5			5
Ending balance (in shares) at Sep. 30, 2023		131,571,000
Ending balance at Sep. 30, 2023	$ 2,083,881	$ 1,316	1,369,465	763,635	(50,535)
Beginning balance (in shares) at Dec. 31, 2023	131,177,513	131,178,000
Beginning balance at Dec. 31, 2023	$ 2,131,828	$ 1,312	1,404,962	762,586	(37,032)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	425,420			425,420
Other comprehensive (loss) income	10,366				10,366
Purchase and retirement of common stock (in shares)		(3,730,000)
Purchase and retirement of common stock	(252,978)	$ (37)	(27,128)	(225,813)
Issuance of common stock under employee stock purchase plan (in shares)		59,000
Issuance of common stock under employee stock purchase plan	3,349	$ 1	3,348
Issuance of common stock under share-based award plans (in shares)		1,248,000
Issuance of common stock under share-based award plans	59,486	$ 12	59,474
Stock-based compensation	37,224		37,224
Dividends declared	$ (60,285)			(60,285)
Ending balance (in shares) at Sep. 30, 2024	128,755,430	128,755,000
Ending balance at Sep. 30, 2024	$ 2,354,410	$ 1,288	1,477,880	901,908	(26,666)
Beginning balance (in shares) at Jun. 30, 2024		129,855,000
Beginning balance at Jun. 30, 2024	2,247,503	$ 1,299	1,465,037	823,549	(42,382)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	154,900			154,900
Other comprehensive (loss) income	15,716				15,716
Purchase and retirement of common stock (in shares)		(1,274,000)
Purchase and retirement of common stock	(85,815)	$ (13)	(9,261)	(76,541)
Issuance of common stock under employee stock purchase plan (in shares)		17,000
Issuance of common stock under employee stock purchase plan	966		965
Issuance of common stock under share-based award plans (in shares)		157,000
Issuance of common stock under share-based award plans	7,444	$ 1	7,443
Stock-based compensation	$ 13,696		13,696
Ending balance (in shares) at Sep. 30, 2024	128,755,430	128,755,000
Ending balance at Sep. 30, 2024	$ 2,354,410	$ 1,288	$ 1,477,880	$ 901,908	$ (26,666)