CONSOLIDATED STATEMENTS OF EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total		Cumulative effect, period of adoption, adjustment	Cumulative effect, period of adoption, adjusted balance	Common Stock	Common Stock Cumulative effect, period of adoption, adjusted balance	Capital in Excess of Par Value	Capital in Excess of Par Value Cumulative effect, period of adoption, adjusted balance	Treasury Stock	Treasury Stock Cumulative effect, period of adoption, adjusted balance	Cumulative Net Income	Cumulative Net Income Cumulative effect, period of adoption, adjustment	Cumulative Net Income Cumulative effect, period of adoption, adjusted balance	Cumulative Dividends	Cumulative Dividends Cumulative effect, period of adoption, adjusted balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative effect, period of adoption, adjusted balance	Noncontrolling Interests	Noncontrolling Interests Cumulative effect, period of adoption, adjusted balance
Balances at beginning of period at Dec. 31, 2019	$ 16,506,627		$ (5,212)	$ 16,501,415	$ 411,005	$ 411,005	$ 20,190,119	$ 20,190,119	$ (78,955)	$ (78,955)	$ 7,353,966	$ (5,212)	$ 7,348,754	$ (12,223,534)	$ (12,223,534)	$ (112,157)	$ (112,157)	$ 966,183	$ 966,183
Comprehensive income:
Net income (loss)	329,272										310,284							18,988
Other comprehensive income (loss)	(6,011)															15,944		(21,955)
Total comprehensive income	323,261
Net change in noncontrolling interests	7,963						37,625											(29,662)
Amounts related to stock incentive plans, net of forfeitures	(1,166)				246		6,608		(8,020)
Net proceeds from issuance of common stock	590,865				6,975		583,890
Dividends paid:
Common stock dividends	(356,001)													(356,001)
Balances at end of period at Mar. 31, 2020	17,066,337				418,226		20,818,242		(86,975)		7,659,038			(12,579,535)		(96,213)		933,554
Comprehensive income:
Net income (loss)	197,905										179,246							18,659
Other comprehensive income (loss)	(14,345)															(20,643)		6,298
Total comprehensive income	183,560
Net change in noncontrolling interests	(62,825)						7,299											(70,124)
Amounts related to stock incentive plans, net of forfeitures	8,264				28		7,404		832
Net proceeds from issuance of common stock	3,693				89		3,604
Repurchase of common stock	(7,656)								(7,656)
Dividends paid:
Common stock dividends	(254,846)													(254,846)
Balances at end of period at Jun. 30, 2020	16,936,527				418,343		20,836,549		(93,799)		7,838,284			(12,834,381)		(116,856)		888,387
Balances at beginning of period at Dec. 31, 2020	16,881,572	[1]			418,691		20,823,145		(104,490)		8,327,598			(13,343,721)		(148,504)		908,853
Comprehensive income:
Net income (loss)	71,369										71,546							(177)
Other comprehensive income (loss)	24,097															20,368		3,729
Total comprehensive income	95,466
Net change in noncontrolling interests	(34,516)						(14,250)											(20,266)
Amounts related to stock incentive plans, net of forfeitures	3,539				175		5,393		(2,029)
Net proceeds from issuance of common stock	(92)						(92)
Dividends paid:
Common stock dividends	(254,952)													(254,952)
Balances at end of period at Mar. 31, 2021	16,691,017				418,866		20,814,196		(106,519)		8,399,144			(13,598,673)		(128,136)		892,139
Comprehensive income:
Net income (loss)	45,952										26,257							19,695
Other comprehensive income (loss)	3,107															188		2,919
Total comprehensive income	49,059
Net change in noncontrolling interests	(1,747)						(17,377)											15,630
Amounts related to stock incentive plans, net of forfeitures	2,441				51		4,504		(2,114)
Net proceeds from issuance of common stock	365,531				5,016		360,515
Dividends paid:
Common stock dividends	(255,472)													(255,472)
Balances at end of period at Jun. 30, 2021	$ 16,850,829				$ 423,933		$ 21,161,838		$ (108,633)		$ 8,425,401			$ (13,854,145)		$ (127,948)		$ 930,383

[1] Note: The consolidated balance sheet at December 31, 2020 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.