CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ 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, 2020	$ 3,087,553	$ 6,547	$ 844,979	$ (61,452)	$ 2,593,393	$ (299,161)	$ 3,247
Beginning balance (in shares) at Dec. 31, 2020		65,472,000				(5,434,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises	505		30			$ 475
Stock option exercises (in shares)						10,000
Issuance of stock for equity awards, net of forfeitures			(6,076)			$ 6,076
Issuance of stock for equity awards, net of forfeitures (in shares)						110,000
Tax withholdings on equity award vesting	(2,853)					$ (2,853)
Tax withholdings on equity award vesting (in shares)						(52,000)
Amortization of share-based compensation	9,148		9,148
Total comprehensive income, net of taxes	11,001			3,769	6,815		417
Return of investment to noncontrolling interests	(25)						(25)
Ending balance at Jun. 30, 2021	3,105,329	$ 6,547	848,081	(57,683)	2,600,208	$ (295,463)	3,639
Ending balance (in shares) at Jun. 30, 2021		65,472,000				(5,366,000)
Beginning balance at Mar. 31, 2021	3,088,744	$ 6,547	846,259	(61,204)	2,590,018	$ (296,353)	3,477
Beginning balance (in shares) at Mar. 31, 2021		65,472,000				(5,384,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises	94		11			$ 83
Stock option exercises (in shares)						2,000
Issuance of stock for equity awards, net of forfeitures			(1,615)			$ 1,615
Issuance of stock for equity awards, net of forfeitures (in shares)						29,000
Tax withholdings on equity award vesting	(808)					$ (808)
Tax withholdings on equity award vesting (in shares)						(13,000)
Amortization of share-based compensation	3,426		3,426
Total comprehensive income, net of taxes	13,873			3,521	10,190		162
Ending balance at Jun. 30, 2021	3,105,329	$ 6,547	848,081	(57,683)	2,600,208	$ (295,463)	3,639
Ending balance (in shares) at Jun. 30, 2021		65,472,000				(5,366,000)
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		65,472,000				(5,361,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises	3,885		691			$ 3,194
Stock option exercises (in shares)						58,000
Issuance of stock for equity awards, net of forfeitures			(8,977)			$ 8,977
Issuance of stock for equity awards, net of forfeitures (in shares)						162,000
Tax withholdings on equity award vesting	(3,192)					$ (3,192)
Tax withholdings on equity award vesting (in shares)						(50,000)
Amortization of share-based compensation	8,555		8,555
Treasury stock purchases	(18,085)					$ (18,085)
Treasury stock purchases (in shares)						(310,000)
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		65,472,000				(5,501,000)
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		65,472,000				(5,243,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises	1,549		253			$ 1,296
Stock option exercises (in shares)						24,000
Issuance of stock for equity awards, net of forfeitures			(1,672)			$ 1,672
Issuance of stock for equity awards, net of forfeitures (in shares)						29,000
Tax withholdings on equity award vesting	(99)					$ (99)
Tax withholdings on equity award vesting (in shares)						(1,000)
Amortization of share-based compensation	2,590		2,590
Treasury stock purchases	(18,085)					$ (18,085)
Treasury stock purchases (in shares)						(310,000)
Total comprehensive income, net of taxes	32,126			3,520	28,457		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		65,472,000				(5,501,000)