CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Total	Total Cumulative Effect, Period of Adoption, Adjustment	Non-controlling interests subject to put provisions	Non-controlling interests subject to put provisions Cumulative Effect, Period of Adoption, Adjustment	Common stock	Additional paid-in capital	Retained earnings	Retained earnings Cumulative Effect, Period of Adoption, Adjustment	Treasury stock	Accumulated other comprehensive income (loss)	Non-controlling interests not subject to put provisions	Non-controlling interests not subject to put provisions Cumulative Effect, Period of Adoption, Adjustment
Beginning Balance (in shares) at Dec. 31, 2018						166,387,000				0
Beginning balance at Dec. 31, 2018		$ 3,703,442	$ 39,876		$ (38)	$ 166	$ 995,006	$ 2,743,194	$ 39,876	$ 0	$ (34,924)	$ 204,956	$ (6)
Temporary equity, beginning balance at Dec. 31, 2018				$ 1,124,641
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income				143,413
Distributions				(155,011)
Contributions				35,572
Acquisitions and divestitures				(6,332)
Partial purchases				(11,394)
Fair value remeasurements				49,525
Temporary equity, ending balance at Dec. 31, 2019				1,180,376
Comprehensive income:
Net income		810,981						810,981				66,900
Other comprehensive income	$ (12,574)	(12,574)									(12,574)
Stock purchase shares issued (in shares)						315,000
Stock purchase plan		16,570				$ 1	16,569
Stock award payment plan (in shares)						161,000
Stock award plan		(3,290)				$ 0	(3,290)
Stock-settled stock-based compensation expense		67,549					67,549
Changes in noncontrolling interest from:
Distributions												(78,112)
Contributions												21,745
Acquisitions and divestitures												(10,170)
Partial purchases		(37,145)					(37,145)					(19,480)
Fair value remeasurements		(49,525)					(49,525)
Purchase of treasury stock (in shares)	(41,020,000)									(41,020,000)
Purchase of treasury stock	$ (2,402,475)	(2,402,475)								$ (2,402,475)
Retirement of treasury stock (in shares)						(41,020,000)				41,020,000
Retirement of treasury stock		0				$ (41)	(240,121)	(2,162,313)		$ 2,402,475
Ending balance at Dec. 31, 2019		2,133,409				$ 126	749,043	1,431,738		$ 0	(47,498)	185,833
Ending Balance (in shares) at Dec. 31, 2019						125,843,000				0
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income				141,879
Distributions				(163,175)
Contributions				30,154
Acquisitions and divestitures				(3,215)
Partial purchases				(7,771)
Fair value remeasurements				151,780
Temporary equity, ending balance at Dec. 31, 2020				1,330,028
Comprehensive income:
Net income		773,642						773,642				79,156
Other comprehensive income	$ (18,656)	(18,656)									(18,656)
Stock purchase shares issued (in shares)						222,000
Stock purchase plan		17,148				$ 0	17,148
Stock award payment plan (in shares)						345,000
Stock award plan		(17,801)				$ 0	(17,801)
Stock-settled stock-based compensation expense		90,007					90,007
Changes in noncontrolling interest from:
Distributions												(89,943)
Contributions												12,812
Acquisitions and divestitures												(248)
Partial purchases												(4,424)
Partial purchases		4,364					4,364
Fair value remeasurements		(151,780)					(151,780)
Purchase of treasury stock (in shares)	(16,477,000)									(16,477,000)
Purchase of treasury stock	$ (1,446,767)	(1,446,767)								$ (1,446,767)
Retirement of treasury stock (in shares)						(16,477,000)				16,477,000
Retirement of treasury stock		0				$ (16)	(93,908)	(1,352,843)		$ 1,446,767
Ending balance at Dec. 31, 2020	$ 1,566,752	1,383,566				$ 110	597,073	852,537		$ 0	(66,154)	183,186
Ending Balance (in shares) at Dec. 31, 2020	109,933,000					109,933,000				0
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income				160,359
Distributions				(159,259)
Contributions				22,672
Acquisitions and divestitures				5,903
Partial purchases				(588)
Fair value remeasurements				75,717
Temporary equity, ending balance at Dec. 31, 2021				$ 1,434,832
Comprehensive income:
Net income		978,450						978,450				72,953
Other comprehensive income	$ (73,093)	(73,093)									(73,093)
Stock purchase shares issued (in shares)						203,000
Stock purchase plan		19,626				$ 0	19,626
Stock award payment plan (in shares)						1,030,000
Stock award plan		(80,641)				$ 1	(80,642)
Stock-settled stock-based compensation expense		100,714					100,714
Changes in noncontrolling interest from:
Distributions												(84,774)
Contributions												9,082
Acquisitions and divestitures		(264)					(264)
Acquisitions and divestitures												1,250
Partial purchases		(13,853)					(13,853)					(1,057)
Fair value remeasurements		(75,717)					(75,717)
Purchase of treasury stock (in shares)	(13,877,000)									(13,877,000)
Purchase of treasury stock	$ (1,546,016)	(1,546,016)								$ (1,546,016)
Retirement of treasury stock (in shares)						(13,877,000)				13,877,000
Retirement of treasury stock		0				$ (14)	(69,352)	(1,476,650)		$ 1,546,016
Deferred taxes from partnership buyouts		62,736					62,736
Ending balance at Dec. 31, 2021	$ 936,148	$ 755,508				$ 97	$ 540,321	$ 354,337		$ 0	$ (139,247)	$ 180,640
Ending Balance (in shares) at Dec. 31, 2021	97,289,000					97,289,000				0