CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	Redeemable Noncontrolling Interest	Total
Balances at Dec. 31, 2017	$ 644	$ (665,297)	$ 1,141,534	$ 2,874,693		$ (156,506)	$ 111,240	$ 3,195,068
Balances, Common Shares at Dec. 31, 2017	237,397,000
Balances, Treasury Shares at Dec. 31, 2017		27,606,000
Dividends declared				(174,355)				(174,355)
Noncontrolling investors, net						(2)		(2)
Share repurchases		$ (523,569)						$ (523,569)
Share repurchases (in shares)	(13,129,000)	13,129,000						13,100,000
Equity-based compensation	$ 1	$ 4,623	18,514	(397)				$ 22,741
Equity-based compensation (in shares)	1,004,000	(185,000)
Net income (loss)				1,258,379		(2,574)		1,255,805
Other comprehensive income (loss), net of tax					$ 301			301
Balances at Dec. 31, 2018	$ 645	$ (1,184,243)	1,160,048	3,958,320	301	(159,082)	111,240	3,775,989
Balances, Common Shares at Dec. 31, 2018	225,272,000
Balances, Treasury Shares at Dec. 31, 2018		40,550,000
Dividends declared				(209,513)				(209,513)
Noncontrolling investors, net						(2,308)		(2,308)
Noncontrolling investors, net							32,374
Share repurchases		$ (348,608)						$ (348,608)
Share repurchases (in shares)	(11,282,000)	11,282,000						11,300,000
Equity-based compensation	$ 1	$ 7,738	20,964	(614)				$ 28,089
Equity-based compensation (in shares)	513,000	(262,000)
Net income (loss)				671,103		6,797		677,900
Other comprehensive income (loss), net of tax					(308)			(308)
Balances at Dec. 31, 2019	$ 646	$ (1,525,113)	1,181,012	4,419,296	(7)	(154,593)	143,614	$ 3,921,241
Balances, Common Shares at Dec. 31, 2019	214,503,000							214,502,639
Balances, Treasury Shares at Dec. 31, 2019		51,570,000						51,570,148
Dividends declared				(210,496)				$ (210,496)
Noncontrolling investors, net						(20,965)		(20,965)
Noncontrolling investors, net							15,000
Share repurchases		$ (106,529)						$ (106,529)
Share repurchases (in shares)	(4,402,000)	4,402,000						4,400,000
Equity-based compensation	$ 2	$ 7,895	26,380	(653)				$ 33,624
Equity-based compensation (in shares)	813,000	(268,000)
Net income (loss)				550,822		20,006		570,828
Other comprehensive income (loss), net of tax					1,909			1,909
Balances at Dec. 31, 2020	$ 648	$ (1,623,747)	$ 1,207,392	$ 4,758,969	$ 1,902	$ (155,552)	$ 158,614	$ 4,189,612
Balances, Common Shares at Dec. 31, 2020	210,914,000							210,914,264
Balances, Treasury Shares at Dec. 31, 2020		55,704,000						55,704,302