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)		634
Share issuances	6,030	$ 6	6,024
Dividends declared	(72,026)				(72,026)
Share repurchases (shares)		(17,390)
Share repurchases	(794,227)	$ (173)			(794,054)
Cash paid for shares withheld for taxes	(13,614)				(13,614)
Share-based compensation	22,335		22,335
Net income	1,107,158				1,107,158
Other comprehensive income	45			45
Ending shareholders' equity (shares) at Jun. 30, 2022		232,570
Ending shareholders' equity at Jun. 30, 2022	7,745,216	$ 2,326	3,319,150	0	4,423,740
Beginning shareholders' equity (shares) at Mar. 31, 2022		239,622
Beginning shareholders' equity at Mar. 31, 2022	7,413,264	$ 2,396	3,309,912	(20)	4,100,976
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share issuances (shares)		48
Dividends declared	(35,514)				(35,514)
Share repurchases (shares)		(7,100)
Share repurchases	(294,227)	$ (70)			(294,157)
Excise tax on share repurchases	3,701				3,701
Share-based compensation	9,238		9,238
Net income	652,435				652,435
Other comprehensive income	20			20
Ending shareholders' equity (shares) at Jun. 30, 2022		232,570
Ending shareholders' equity at Jun. 30, 2022	7,745,216	$ 2,326	3,319,150	0	4,423,740
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)		473
Share issuances	4,842	$ 4	4,838
Dividends declared	(71,772)				(71,772)
Share repurchases (shares)		(6,421)
Share repurchases	(400,000)	$ (63)			(399,937)
Cash paid for shares withheld for taxes	(10,388)				(10,388)
Share-based compensation	19,342		19,342
Net income	1,252,604				1,252,604
Other comprehensive income	0			0
Ending shareholders' equity (shares) at Jun. 30, 2023		219,892
Ending shareholders' equity at Jun. 30, 2023	9,705,025	$ 2,199	3,354,318	0	6,348,508
Beginning shareholders' equity (shares) at Mar. 31, 2023		223,522
Beginning shareholders' equity at Mar. 31, 2023	9,263,809	$ 2,235	3,345,005	0	5,916,569
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share issuances (shares)		30
Dividends declared	(35,633)				(35,633)
Share repurchases (shares)		(3,660)
Share repurchases	(250,000)	$ (36)			(249,964)
Excise tax on share repurchases	2,480				2,480
Cash paid for shares withheld for taxes	(329)				(329)
Share-based compensation	9,313		9,313
Net income	720,345				720,345
Other comprehensive income	0			0
Ending shareholders' equity (shares) at Jun. 30, 2023		219,892
Ending shareholders' equity at Jun. 30, 2023	$ 9,705,025	$ 2,199	$ 3,354,318	$ 0	$ 6,348,508