Consolidated Statements Of Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Shareholders' Equity, shares at Dec. 31, 2018			277,110,000
Shareholders' Equity at Dec. 31, 2018	$ 4,817,782		$ 2,771	$ 3,201,427	$ (345)	$ 1,613,929
Stock option exercises, shares			547,000
Stock option exercises	6,399		$ 5	6,394
Share issuances, net of cancellations, shares			1,013,000
Share issuances	5,800		$ 10	5,790
Dividends declared	(124,356)					(124,356)
Share repurchases, shares			(8,435,000)
Share repurchases	(274,333)		$ (84)			(274,249)
Cash paid for shares withheld for taxes	(11,450)			0		(11,450)
Share-based compensation	21,538			21,538
Net income	1,016,700					1,016,700
Other comprehensive income	100				100
Shareholders' Equity, shares at Dec. 31, 2019			270,235,000
Shareholders' Equity at Dec. 31, 2019	5,458,180	$ (735)	$ 2,702	3,235,149	(245)	2,220,574
Stock option exercises, shares			15,000
Stock option exercises	111		$ 1	110
Share issuances, net of cancellations, shares			756,000
Share issuances	4,096		$ 8	4,088
Dividends declared	(135,138)					(135,138)
Share repurchases, shares			(4,542,000)
Share repurchases	(170,676)		$ (46)			(170,630)
Cash paid for shares withheld for taxes	(14,853)					(14,853)
Share-based compensation	22,065			22,065
Net income	1,406,839					1,406,839
Other comprehensive income	$ 100				100
Shareholders' Equity, shares at Dec. 31, 2020	266,464,063		266,464,000
Shareholders' Equity at Dec. 31, 2020	$ 6,569,989		$ 2,665	3,261,412	(145)	3,306,057
Stock option exercises, shares			1,000
Stock option exercises	11		$ 0	11
Share issuances, net of cancellations, shares			525,000
Share issuances	4,181		$ 5	4,176
Dividends declared	(148,133)					(148,133)
Share repurchases, shares			(17,664,000)
Share repurchases	(897,303)		$ (177)			(897,126)
Cash paid for shares withheld for taxes	(10,842)					(10,842)
Share-based compensation	25,192			25,192
Net income	1,946,320					1,946,320
Other comprehensive income	$ 100				100
Shareholders' Equity, shares at Dec. 31, 2021	249,325,873		249,326,000
Shareholders' Equity at Dec. 31, 2021	$ 7,489,515		$ 2,493	$ 3,290,791	$ (45)	$ 4,196,276