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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, 2018		277,110
Shareholders' equity at Dec. 31, 2018	$ 4,817,782	$ 2,771	$ 3,201,427	$ (345)	$ 1,613,929
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (shares)		544
Stock option exercises	6,367	$ 5	6,362
Stock issuances (shares)		987
Share issuances	5,800	$ 10	5,790
Dividends declared	(91,595)				(91,595)
Share repurchases (shares)		(7,670)
Share repurchases	(244,388)	$ (76)			(244,312)
Cash paid for shares withheld for taxes	(10,722)				(10,722)
Share-based compensation	17,371		17,371
Net income	680,902				680,902
Other comprehensive income	75			75
Shareholders' equity (shares) at Sep. 30, 2019		270,971
Shareholders' equity at Sep. 30, 2019	5,181,592	$ 2,710	3,230,950	(270)	1,948,202
Shareholders' equity (shares) at Jun. 30, 2019		274,975
Shareholders' equity at Jun. 30, 2019	5,069,807	$ 2,750	3,225,874	(295)	1,841,478
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (shares)		110
Stock option exercises	1,159	$ 1	1,158
Stock issuances (shares)		13
Share issuances	0
Dividends declared	(30,132)				(30,132)
Share repurchases (shares)		(4,127)
Share repurchases	(135,917)	$ (41)			(135,876)
Cash paid for shares withheld for taxes	(372)				(372)
Share-based compensation	3,918		3,918
Net income	273,104				273,104
Other comprehensive income	25			25
Shareholders' equity (shares) at Sep. 30, 2019		270,971
Shareholders' equity at Sep. 30, 2019	5,181,592	$ 2,710	3,230,950	(270)	1,948,202
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
Stock 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