CONSOLIDATED STATEMENTS OF EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Cumulative effect, period of adoption, adjustment	Cumulative effect, period of adoption, adjusted balance	Preferred Stock	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	Other Equity	Other Equity 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, 2018	$ 15,586,599			$ 718,498	$ 384,465		$ 18,424,368		$ (68,499)		$ 6,121,534			$ (10,818,557)		$ (129,769)		$ 294		$ 954,265
Comprehensive income:
Net income (loss)	291,255										280,470									10,785
Other comprehensive income (loss)	(9,062)															(14,849)				5,787
Total comprehensive income	282,193
Net change in noncontrolling interests	(10,342)						(8,845)													(1,497)
Amounts related to stock incentive plans, net of forfeitures	1,521				120		7,420		(5,993)									(26)
Net proceeds from issuance of common stock	532,620				7,212		525,408
Conversion of preferred stock	0			(718,498)	12,712		705,786
Dividends paid:
Common stock dividends	(344,760)													(344,760)
Balances at end of period at Mar. 31, 2019	16,047,831			0	404,509		19,654,137		(74,492)		6,402,004			(11,163,317)		(144,618)		268		969,340
Balances at beginning of period at Dec. 31, 2018	15,586,599			718,498	384,465		18,424,368		(68,499)		6,121,534			(10,818,557)		(129,769)		294		954,265
Comprehensive income:
Other comprehensive income (loss)	15,431
Balances at end of period at Sep. 30, 2019	16,225,729			0	406,498		19,796,676		(78,843)		7,129,642			(11,870,244)		(117,676)		12		959,664
Balances at beginning of period at Mar. 31, 2019	16,047,831			0	404,509		19,654,137		(74,492)		6,402,004			(11,163,317)		(144,618)		268		969,340
Comprehensive income:
Net income (loss)	149,111										137,762									11,349
Other comprehensive income (loss)	46,383															43,996				2,387
Total comprehensive income	195,494
Net change in noncontrolling interests	(31,631)						(23,672)													(7,959)
Amounts related to stock incentive plans, net of forfeitures	8,347				18		7,959		450									(80)
Net proceeds from issuance of common stock	103,208				1,487		101,721
Dividends paid:
Common stock dividends	(353,677)													(353,677)
Balances at end of period at Jun. 30, 2019	15,969,572			0	406,014		19,740,145		(74,042)		6,539,766			(11,516,994)		(100,622)		188		975,117
Comprehensive income:
Net income (loss)	619,824										589,876									29,948
Other comprehensive income (loss)	(21,890)															(17,054)				(4,836)
Total comprehensive income	597,934
Net change in noncontrolling interests	(27,527)						13,038													(40,565)
Amounts related to stock incentive plans, net of forfeitures	127				4		5,100		(4,801)									(176)
Net proceeds from issuance of common stock	38,873				480		38,393
Dividends paid:
Common stock dividends	(353,250)													(353,250)
Balances at end of period at Sep. 30, 2019	16,225,729			$ 0	406,498		19,796,676		(78,843)		7,129,642			(11,870,244)		(117,676)		12		959,664
Balances at beginning of period at Dec. 31, 2019	16,506,627	$ (5,212)	$ 16,501,415		411,005	$ 411,005	20,190,107	$ 20,190,107	(78,955)	$ (78,955)	7,353,966	$ (5,212)	$ 7,348,754	(12,223,534)	$ (12,223,534)	(112,157)	$ (112,157)	12	$ 12	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		20,818,230		(86,975)		7,659,038			(12,579,535)		(96,213)		12		933,554
Balances at beginning of period at Dec. 31, 2019	16,506,627	$ (5,212)	$ 16,501,415		411,005	$ 411,005	20,190,107	$ 20,190,107	(78,955)	$ (78,955)	7,353,966	$ (5,212)	$ 7,348,754	(12,223,534)	$ (12,223,534)	(112,157)	$ (112,157)	12	$ 12	966,183	$ 966,183
Comprehensive income:
Other comprehensive income (loss)	(22,780)
Balances at end of period at Sep. 30, 2020	16,961,102				418,361		20,835,022		(94,022)		8,163,869			(13,088,891)		(126,469)		4		853,228
Balances at beginning of period at Mar. 31, 2020	17,066,337				418,226		20,818,230		(86,975)		7,659,038			(12,579,535)		(96,213)		12		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		7,412		832									(8)
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		20,836,545		(93,799)		7,838,284			(12,834,381)		(116,856)		4		888,387
Comprehensive income:
Net income (loss)	393,235										325,585									67,650
Other comprehensive income (loss)	(2,275)															(9,613)				7,338
Other comprehensive income (loss)	(2,159)
Total comprehensive income	390,960
Net change in noncontrolling interests	(118,041)						(7,894)													(110,147)
Amounts related to stock incentive plans, net of forfeitures	6,364				18		6,569		(223)
Net proceeds from issuance of common stock	(198)						(198)
Dividends paid:
Common stock dividends	(254,510)													(254,510)
Balances at end of period at Sep. 30, 2020	$ 16,961,102				$ 418,361		$ 20,835,022		$ (94,022)		$ 8,163,869			$ (13,088,891)		$ (126,469)		$ 4		$ 853,228