CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Noncontrolling Interests [Member]
Beginning balance at Dec. 31, 2021	$ 2,888,782	$ 6,547	$ 854,512	$ (25,966)	$ 2,346,439	$ (295,208)	$ 2,458
Beginning balance (in shares) at Dec. 31, 2021		65,472				(5,361)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises	3,885		691			$ 3,194
Stock option exercises (in shares)						58
Issuance of stock for equity awards, net of forfeitures			(8,977)			$ 8,977
Issuance of stock for equity awards, net of forfeitures (in shares)						162
Tax withholdings on equity award vesting	(3,192)					$ (3,192)
Tax withholdings on equity award vesting (in shares)						(50)
Amortization of unearned share-based compensation	8,555		8,555
Treasury stock purchases	(18,085)					$ (18,085)
Treasury stock purchases (in shares)						(310)
Total comprehensive income, net of taxes	50,201			4,009	45,891		301
Return of investment to noncontrolling interests	(402)						(402)
Ending balance at Jun. 30, 2022	2,929,744	$ 6,547	854,781	(21,957)	2,392,330	$ (304,314)	2,357
Ending balance (in shares) at Jun. 30, 2022		65,472				(5,501)
Beginning balance at Mar. 31, 2022	2,911,865	$ 6,547	853,610	(25,477)	2,363,873	$ (289,098)	2,410
Beginning balance (in shares) at Mar. 31, 2022		65,472				(5,243)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises	1,549		253			$ 1,296
Stock option exercises (in shares)						24
Issuance of stock for equity awards, net of forfeitures			(1,672)			$ 1,672
Issuance of stock for equity awards, net of forfeitures (in shares)						29
Tax withholdings on equity award vesting	(99)					$ (99)
Tax withholdings on equity award vesting (in shares)						(1)
Amortization of unearned share-based compensation	2,590		2,590
Treasury stock purchases	(18,085)					$ (18,085)
Treasury stock purchases (in shares)						(310)
Total comprehensive income, net of taxes	32,126			3,520	28,457	$ 0	149
Return of investment to noncontrolling interests	(202)						(202)
Ending balance at Jun. 30, 2022	2,929,744	$ 6,547	854,781	(21,957)	2,392,330	$ (304,314)	2,357
Ending balance (in shares) at Jun. 30, 2022		65,472				(5,501)
Beginning balance at Dec. 31, 2022	3,045,168	$ 6,547	859,345	16,853	2,468,730	$ (308,598)	2,291
Beginning balance (in shares) at Dec. 31, 2022		65,472				(5,565)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises	118		(217)			$ 335
Stock option exercises (in shares)						13
Issuance of stock for equity awards, net of forfeitures			(10,075)			$ 10,075
Issuance of stock for equity awards, net of forfeitures (in shares)						182
Tax withholdings on equity award vesting	(3,595)					$ (3,595)
Tax withholdings on equity award vesting (in shares)						(54)
Amortization of unearned share-based compensation	8,912		8,912
Treasury stock purchases	(37,600)					$ (37,600)
Treasury stock purchases (in shares)						(522)
Excise taxes on treasury stock purchases	(276)					$ (276)
Total comprehensive income, net of taxes	100,082			2,143	98,065		126
Ending balance at Jun. 30, 2023	3,112,809	$ 6,547	857,965	18,996	2,566,795	$ (339,659)	2,165
Ending balance (in shares) at Jun. 30, 2023		65,472				(5,946)
Beginning balance at Mar. 31, 2023	3,085,140	$ 6,547	856,680	17,017	2,509,428	$ (306,746)	2,214
Beginning balance (in shares) at Mar. 31, 2023		65,472				(5,504)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (in shares)						33
Issuance of stock for equity awards, net of forfeitures			(1,819)			$ 1,819
Tax withholdings on equity award vesting	(40)					(40)
Amortization of unearned share-based compensation	3,104		3,104
Treasury stock purchases	(34,416)					$ (34,416)
Treasury stock purchases (in shares)						(475)
Excise taxes on treasury stock purchases	(276)					$ (276)
Total comprehensive income, net of taxes	59,297			1,979	57,367	0	(49)
Ending balance at Jun. 30, 2023	$ 3,112,809	$ 6,547	$ 857,965	$ 18,996	$ 2,566,795	$ (339,659)	$ 2,165
Ending balance (in shares) at Jun. 30, 2023		65,472				(5,946)