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	411		19	0	0	$ 392	0
Stock option exercises (in shares)						8,000
Issuance of stock for equity awards, net of forfeitures	0		(4,461)	0	0	$ 4,461	0
Issuance of stock for equity awards, net of forfeitures (in shares)						81,000
Tax withholdings on equity award vesting	(2,045)					$ (2,045)	0
Tax withholdings on equity award vesting (in shares)						(39,000)
Amortization of share-based compensation	5,722		5,722	0	0	$ 0	0
Total comprehensive income, net of taxes	(2,872)			248	(3,375)	0	255
Return of investment to noncontrolling interests	(25)						(25)
Ending balance at Mar. 31, 2021	3,088,744	$ 6,547	846,259	(61,204)	2,590,018	$ (296,353)	3,477
Ending balance (in shares) at Mar. 31, 2021		65,472,000				(5,384)
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	2,336		438	0	0	$ 1,898	0
Stock option exercises (in shares)						34,000
Issuance of stock for equity awards, net of forfeitures	0		(7,305)	0	0	$ 7,305	0
Issuance of stock for equity awards, net of forfeitures (in shares)						133,000
Tax withholdings on equity award vesting	(3,093)					$ (3,093)	0
Tax withholdings on equity award vesting (in shares)						(49,000)
Amortization of share-based compensation	5,965		5,965	0	0	$ 0	0
Total comprehensive income, net of taxes	18,075			489	17,434	0	152
Return of investment to noncontrolling interests	(200)						(200)
Ending balance at Mar. 31, 2022	$ 2,911,865	$ 6,547	$ 853,610	$ (25,477)	$ 2,363,873	$ (289,098)	$ 2,410
Ending balance (in shares) at Mar. 31, 2022		65,472,000				(5,243,000)