CONSOLIDATED STATEMENTS OF EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total		Preferred Stock	Common Stock	Capital in Excess of Par Value	Treasury Stock	Cumulative Net Income	Cumulative Dividends	Accumulated Other Comprehensive Income (Loss)	Other Equity	Noncontrolling Interests
Balances at beginning of period at Dec. 31, 2017	$ 14,925,452		$ 718,503	$ 372,449	$ 17,662,681	$ (64,559)	$ 5,316,580	$ (9,471,712)	$ (111,465)	$ 670	$ 502,305
Comprehensive income:
Net income (loss)	454,538						449,347				5,191
Other comprehensive income	16,326								20,212		(3,886)
Total comprehensive income	470,864
Net change in noncontrolling interests	(15,876)				(13,157)						(2,719)
Amounts related to stock incentive plans, net of forfeitures	7,098			150	11,085	(4,137)
Proceeds from issuance of common stock	7,190			130	7,060
Conversion of preferred stock	0		(5)		5
Dividends paid:
Common stock dividends	(323,726)							(323,726)
Preferred stock dividends	(11,676)							(11,676)
Balances at end of period at Mar. 31, 2018	15,059,326		718,498	372,729	17,667,674	(68,696)	5,765,927	(9,807,114)	(91,253)	670	500,891
Balances at beginning of period at Dec. 31, 2017	14,925,452		718,503	372,449	17,662,681	(64,559)	5,316,580	(9,471,712)	(111,465)	670	502,305
Comprehensive income:
Other comprehensive income	(33,797)
Balances at end of period at Jun. 30, 2018	14,800,487		718,498	372,801	17,661,384	(68,661)	5,932,035	(10,142,162)	(132,631)	659	458,564
Balances at beginning of period at Mar. 31, 2018	15,059,326		718,498	372,729	17,667,674	(68,696)	5,765,927	(9,807,114)	(91,253)	670	500,891
Comprehensive income:
Net income (loss)	168,463						166,108				2,355
Other comprehensive income	(50,123)								(41,378)		(8,745)
Total comprehensive income	118,340
Net change in noncontrolling interests	(50,759)				(14,822)						(35,937)
Amounts related to stock incentive plans, net of forfeitures	5,843			18	5,801	35				(11)
Proceeds from issuance of common stock	2,785			54	2,731
Dividends paid:
Common stock dividends	(323,372)							(323,372)
Preferred stock dividends	(11,676)							(11,676)
Balances at end of period at Jun. 30, 2018	14,800,487		718,498	372,801	17,661,384	(68,661)	5,932,035	(10,142,162)	(132,631)	659	458,564
Balances at beginning of period at Dec. 31, 2018	15,586,599	[1]	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	(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)
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	[1]	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	37,321
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
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	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)
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

[1] The consolidated balance sheet at December 31, 2018 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.