Condensed Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Capital In Excess Of Par Value [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2020	$ 3,326,288	$ 11,706	$ 226,451	$ 3,088,131
Balance, in shares at Dec. 31, 2020		117,058
Net income	755,569			755,569
Share repurchases, including settlements under accelerated share repurchase programs, shares		(2,083)
Share repurchases, including settlements under accelerated share repurchase programs	(467,715)	$ (209)	68,750	(536,256)
Forward contract for accelerated share repurchases	(131,250)		(131,250)
Cash dividends declared	(69,387)			(69,387)
Share-based compensation and share issuances, net of forfeitures, shares		57
Share-based compensation and share issuances, net of forfeitures	10,934	$ 6	10,928
Taxes paid in exchange for shares withheld, shares		(21)
Taxes paid in exchange for shares withheld	(4,541)	$ (2)	(4,539)
Balance at Sep. 30, 2021	3,419,898	$ 11,501	170,340	3,238,057
Balance, in shares at Sep. 30, 2021		115,011
Balance at Jun. 30, 2021	3,402,378	$ 11,581	160,204	3,230,593
Balance, in shares at Jun. 30, 2021		115,810
Net income	286,634			286,634
Share repurchases, including settlements under accelerated share repurchase programs, shares		(796)
Share repurchases, including settlements under accelerated share repurchase programs	(187,500)	$ (80)	68,750	(256,170)
Forward contract for accelerated share repurchases	(62,500)		(62,500)
Cash dividends declared	(23,000)			(23,000)
Share-based compensation and share issuances, net of forfeitures, shares		(3)
Share-based compensation and share issuances, net of forfeitures	3,886		3,886
Balance at Sep. 30, 2021	3,419,898	$ 11,501	170,340	3,238,057
Balance, in shares at Sep. 30, 2021		115,011
Balance at Dec. 31, 2021	3,679,807	$ 11,501	174,445	3,493,861
Balance, in shares at Dec. 31, 2021		115,011
Net income	1,053,230			1,053,230
Share repurchases, including settlements under accelerated share repurchase programs, shares		(4,085)
Share repurchases, including settlements under accelerated share repurchase programs	(977,301)	$ (409)	162,500	(1,139,392)
Forward contract for accelerated share repurchases	(100,000)		(100,000)
Cash dividends declared	(101,414)			(101,414)
Share-based compensation and share issuances, net of forfeitures, shares		55
Share-based compensation and share issuances, net of forfeitures	12,033	$ 6	12,027
Taxes paid in exchange for shares withheld, shares		(27)
Taxes paid in exchange for shares withheld	(8,185)	$ (3)	(8,182)
Balance at Sep. 30, 2022	3,558,170	$ 11,095	240,790	3,306,285
Balance, in shares at Sep. 30, 2022		110,954
Balance at Jun. 30, 2022	3,555,829	$ 11,224	236,991	3,307,614
Balance, in shares at Jun. 30, 2022		112,236
Net income	377,401			377,401
Share repurchases	345,431	$ 129		345,302
Share repurchases, shares		1,282
Cash dividends declared	(33,428)			(33,428)
Share-based compensation and share issuances, net of forfeitures	3,860		3,860
Taxes paid in exchange for shares withheld	(61)		(61)
Balance at Sep. 30, 2022	$ 3,558,170	$ 11,095	$ 240,790	$ 3,306,285
Balance, in shares at Sep. 30, 2022		110,954