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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
Shareholders' equity (shares) at Dec. 31, 2020		266,464
Shareholders' equity at Dec. 31, 2020	$ 6,569,989	$ 2,665	$ 3,261,412	$ (145)	$ 3,306,057
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (shares)		1
Stock option exercises	11		11
Share issuances (shares)		517
Share issuances	4,181	$ 5	4,176
Dividends declared	(74,139)				(74,139)
Share repurchases (shares)		(6,915)
Share repurchases	(353,703)	$ (70)			(353,633)
Cash paid for shares withheld for taxes	(10,607)				(10,607)
Share-based compensation	15,180		15,180
Net income	807,506				807,506
Other comprehensive income	50			50
Shareholders' equity (shares) at Jun. 30, 2021		260,067
Shareholders' equity at Jun. 30, 2021	6,958,468	$ 2,600	3,280,779	(95)	3,675,184
Shareholders' equity (shares) at Mar. 31, 2021		263,637
Shareholders' equity at Mar. 31, 2021	6,685,274	$ 2,636	3,274,154	(120)	3,408,604
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share issuances (shares)		12
Dividends declared	(36,814)				(36,814)
Share repurchases (shares)		(3,582)
Share repurchases	(200,000)	$ (36)			(199,964)
Cash paid for shares withheld for taxes	(41)				(41)
Share-based compensation	6,625		6,625
Net income	503,399				503,399
Other comprehensive income	25			25
Shareholders' equity (shares) at Jun. 30, 2021		260,067
Shareholders' equity at Jun. 30, 2021	6,958,468	$ 2,600	3,280,779	(95)	3,675,184
Shareholders' equity (shares) at Dec. 31, 2021		249,326
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
Shareholders' equity (shares) at Jun. 30, 2022		232,570
Shareholders' equity at Jun. 30, 2022	7,745,216	$ 2,326	3,319,150	0	4,423,740
Shareholders' equity (shares) at Mar. 31, 2022		239,622
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)
Cash paid for shares withheld for taxes	0
Share-based compensation	9,238		9,238
Net income	652,435				652,435
Other comprehensive income	20			20
Shareholders' equity (shares) at Jun. 30, 2022		232,570
Shareholders' equity at Jun. 30, 2022	$ 7,745,216	$ 2,326	$ 3,319,150	$ 0	$ 4,423,740

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