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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, 2017		286,752
Shareholders' equity at Dec. 31, 2017	$ 4,154,026	$ 2,868	$ 3,171,542	$ (445)	$ 980,061
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting change	22,411				22,411
Stock option exercises (shares)		514
Stock option exercises	5,462	$ 5	5,457
Stock issuances (shares)		611
Share issuances	3,480	$ 6	3,474
Dividends declared	(77,673)				(77,673)
Share repurchases (shares)		(5,810)
Share repurchases	(172,060)	$ (58)			(172,002)
Cash paid for shares withheld for taxes	(7,376)		(284)		(7,092)
Share-based compensation	16,158		16,158
Net income	784,375				784,375
Other comprehensive income	75			75
Shareholders' equity (shares) at Sep. 30, 2018		282,067
Shareholders' equity at Sep. 30, 2018	4,728,878	$ 2,821	3,196,347	(370)	1,530,080
Shareholders' equity (shares) at Jun. 30, 2018		284,362
Shareholders' equity at Jun. 30, 2018	4,526,711	$ 2,843	3,191,087	(395)	1,333,176
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting change	0
Stock option exercises (shares)		80
Stock option exercises	995	$ 1	994
Stock issuances (shares)		(6)
Share issuances	0	$ 1	(1)
Dividends declared	(25,707)				(25,707)
Share repurchases (shares)		(2,369)
Share repurchases	(66,948)	$ (24)			(66,924)
Cash paid for shares withheld for taxes	0
Share-based compensation	4,267		4,267
Net income	289,535				289,535
Other comprehensive income	25			25
Shareholders' equity (shares) at Sep. 30, 2018		282,067
Shareholders' equity at Sep. 30, 2018	4,728,878	$ 2,821	3,196,347	(370)	1,530,080
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)	0		(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

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