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, 2014	$ 13,473,049	$ 1,006,250	$ 328,835	$ 14,740,712	$ (35,241)	$ 2,842,022	$ (5,635,923)	$ (77,009)	$ 5,507	$ 297,896
Comprehensive income:
Net income (loss)	209,076					207,151				1,925
Other comprehensive income	(43,043)							(30,487)		(12,556)
Total comprehensive income	166,033
Net change in noncontrolling interests	70,757			(4,540)						75,297
Amounts related to stock incentive plans, net of forfeitures	350		85	7,672	(6,132)				(1,275)
Proceeds from issuance of common stock	1,490,821		20,466	1,470,355
Equity component of convertible debt	5,643		1,048	4,595
Option compensation expense	217								217
Cash dividends paid:
Common stock	(272,569)						(272,569)
Preferred Stock	(16,352)						(16,352)
Balances at end of period at Mar. 31, 2015	14,917,949	1,006,250	350,434	16,218,794	(41,373)	3,049,173	(5,924,844)	(107,496)	4,449	362,562
Balances at beginning of period at Dec. 31, 2015	15,175,885	1,006,250	354,811	16,478,300	(44,372)	3,725,772	(6,846,056)	(88,243)	4,098	585,325
Comprehensive income:
Net income (loss)	166,403					165,321				1,082
Other comprehensive income	(5,692)							(20,810)		15,118
Total comprehensive income	160,711
Distributions to noncontrolling interests	(127,042)			(5,717)						(121,325)
Amounts related to stock incentive plans, net of forfeitures	19,178		637	25,555	(6,899)				(115)
Proceeds from issuance of common stock	93,105		1,505	91,600
Option compensation expense	79								79
Cash dividends paid:
Common stock	(305,770)						(305,770)
Preferred Stock	(16,352)						(16,352)
Balances at end of period at Mar. 31, 2016	$ 14,999,794	$ 1,006,250	$ 356,953	$ 16,589,738	$ (51,271)	$ 3,891,093	$ (7,168,178)	$ (109,053)	$ 4,062	$ 480,200