CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	AOCI Attributable to Parent [Member]	Noncontrolling Interests	Redeemable Noncontrolling Interest	Total
Balances at Dec. 31, 2016	$ 641	$ (416,829)	$ 1,132,749	$ 2,210,459		$ (149,561)	$ 111,240	$ 2,777,459
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2016	243,785,000
Treasury Stock, Shares, Beginning Balance at Dec. 31, 2016		20,345,000
Dividends declared				(148,231)				(148,231)
Share repurchases		$ (252,242)						$ (252,242)
Share repurchases (in shares)	(7,439,000)	7,439,000						7,400,000
Equity-based compensation	$ 3	$ 3,774	8,785	(276)				$ 12,286
Equity-based compensation (in shares)	1,051,000	(178,000)
Comprehensive and net income (loss)				812,741		(6,945)		805,796
Net income								805,796
Balances at Dec. 31, 2017	$ 644	$ (665,297)	1,141,534	2,874,693		(156,506)	111,240	3,195,068
Common Stock, Shares, Outstanding, Ending Balance at Dec. 31, 2017	237,397,000
Treasury Stock, Shares, Ending Balance 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)
Comprehensive and net income (loss)								1,256,106
Net income				1,258,379		(2,574)		1,255,805
Other comprehensive 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
Common Stock, Shares, Outstanding, Ending Balance at Dec. 31, 2018	225,272,000							225,272,174
Treasury Stock, Shares, Ending Balance at Dec. 31, 2018		40,550,000						40,550,228
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)
Comprehensive and net income (loss)								677,592
Net income				671,103		6,797		677,900
Other comprehensive 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
Common Stock, Shares, Outstanding, Ending Balance at Dec. 31, 2019	214,503,000							214,502,639
Treasury Stock, Shares, Ending Balance at Dec. 31, 2019		51,570,000						51,570,148