Consolidated Statements Of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Beginning shareholders' equity (shares) at Dec. 31, 2021		249,326
Beginning shareholders' equity at Dec. 31, 2021	$ 7,489,515	$ 2,493	$ 3,290,791	$ (45)	$ 4,196,276
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share issuances (shares)		675
Share issuances	6,030	$ 6	6,024
Dividends declared	(106,650)				(106,650)
Share repurchases (shares)		(21,769)
Share repurchases	(974,673)	$ (217)			(974,456)
Cash paid for shares withheld for taxes	(14,325)				(14,325)
Share-based compensation	28,975		28,975
Net income	1,735,086				1,735,086
Other comprehensive income	45			45
Ending shareholders' equity (shares) at Sep. 30, 2022		228,232
Ending shareholders' equity at Sep. 30, 2022	8,164,003	$ 2,282	3,325,790	0	4,835,931
Beginning shareholders' equity (shares) at Jun. 30, 2022		232,570
Beginning shareholders' equity at Jun. 30, 2022	7,745,216	$ 2,326	3,319,150	0	4,423,740
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (shares)		41
Dividends declared	(34,624)				(34,624)
Share repurchases (shares)		(4,379)
Share repurchases	(180,446)	$ (44)			(180,402)
Cash paid for shares withheld for taxes	(711)				(711)
Share-based compensation	6,640		6,640
Net income	627,928				627,928
Other comprehensive income	0
Ending shareholders' equity (shares) at Sep. 30, 2022		228,232
Ending shareholders' equity at Sep. 30, 2022	8,164,003	$ 2,282	3,325,790	0	4,835,931
Beginning shareholders' equity (shares) at Dec. 31, 2022		225,840
Beginning shareholders' equity at Dec. 31, 2022	8,914,098	$ 2,258	3,330,138	0	5,581,702
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share issuances (shares)		474
Share issuances	4,842	$ 4	4,838
Dividends declared	(106,792)				(106,792)
Share repurchases (shares)		(10,179)
Share repurchases	(700,000)	$ (101)			(699,899)
Excise tax on share repurchases	(6,701)				(6,701)
Cash paid for shares withheld for taxes	(10,408)				(10,408)
Share-based compensation	26,083		26,083
Net income	1,891,379				1,891,379
Other comprehensive income	0
Ending shareholders' equity (shares) at Sep. 30, 2023		216,135
Ending shareholders' equity at Sep. 30, 2023	10,012,501	$ 2,161	3,361,059	0	6,649,281
Beginning shareholders' equity (shares) at Jun. 30, 2023		219,892
Beginning shareholders' equity at Jun. 30, 2023	9,705,025	$ 2,199	3,354,318	0	6,348,508
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share issuances (shares)		1
Dividends declared	(35,020)				(35,020)
Share repurchases (shares)		(3,758)
Share repurchases	(300,000)	$ (38)			(299,962)
Excise tax on share repurchases	3,000				3,000
Cash paid for shares withheld for taxes	(20)				(20)
Share-based compensation	6,741		6,741
Net income	638,775				638,775
Other comprehensive income	0
Ending shareholders' equity (shares) at Sep. 30, 2023		216,135
Ending shareholders' equity at Sep. 30, 2023	$ 10,012,501	$ 2,161	$ 3,361,059	$ 0	$ 6,649,281