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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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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	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment Retained Earnings
Shareholders' equity (shares) at Dec. 31, 2019		270,235
Shareholders' equity at Dec. 31, 2019	$ 5,458,180	$ 2,702	$ 3,235,149	$ (245)	$ 2,220,574	$ (735)	$ (735)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (shares)		14
Stock option exercises	111		111
Share issuances (shares)		755
Share issuances	4,096	$ 8	4,088
Dividends declared	(97,501)				(97,501)
Share repurchases (shares)		(2,825)
Share repurchases	(95,676)	$ (28)			(95,648)
Cash paid for shares withheld for taxes	(14,853)				(14,853)
Share-based compensation	17,590		17,590
Net income	968,728				968,728
Other comprehensive income	75			75
Shareholders' equity (shares) at Sep. 30, 2020		268,179
Shareholders' equity at Sep. 30, 2020	6,240,015	$ 2,682	3,256,938	(170)	2,980,565
Shareholders' equity (shares) at Jun. 30, 2020		268,178
Shareholders' equity at Jun. 30, 2020	5,851,668	$ 2,682	3,252,568	(195)	2,596,613
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (shares)		1
Stock option exercises	12		12
Dividends declared	(32,446)				(32,446)
Share-based compensation	4,358		4,358
Net income	416,398				416,398
Other comprehensive income	25			25
Shareholders' equity (shares) at Sep. 30, 2020		268,179
Shareholders' equity at Sep. 30, 2020	6,240,015	$ 2,682	3,256,938	(170)	2,980,565
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)		518
Share issuances	4,181	$ 5	4,176
Dividends declared	(110,305)				(110,305)
Share repurchases (shares)		(12,017)
Share repurchases	(614,303)	$ (120)			(614,183)
Cash paid for shares withheld for taxes	(10,642)				(10,642)
Share-based compensation	19,691		19,691
Net income	1,283,055				1,283,055
Other comprehensive income	75			75
Shareholders' equity (shares) at Sep. 30, 2021		254,966
Shareholders' equity at Sep. 30, 2021	7,141,752	$ 2,550	3,285,290	(70)	3,853,982
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share issuances (shares)		1
Share issuances	0	$ 0	0
Dividends declared	(36,166)				(36,166)
Share repurchases (shares)		(5,102)
Share repurchases	(260,600)	$ (50)			(260,550)
Cash paid for shares withheld for taxes	(35)				(35)
Share-based compensation	4,511		4,511
Net income	475,549				475,549
Other comprehensive income	25			25
Shareholders' equity (shares) at Sep. 30, 2021		254,966
Shareholders' equity at Sep. 30, 2021	$ 7,141,752	$ 2,550	$ 3,285,290	$ (70)	$ 3,853,982