Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues
Revenues from rental properties	$ 283,387	$ 246,555	$ 847,973	$ 703,139
Management and other fee income	4,995	8,679	17,926	26,245
Total revenues	288,382	255,234	865,899	729,384
Operating expenses
Rent	2,913	3,559	9,479	10,362
Real estate taxes	36,571	31,470	109,343	91,542
Operating and maintenance	34,915	30,561	104,926	85,618
General and administrative expenses	27,310	28,632	89,322	94,525
Provision for doubtful accounts	1,920	901	5,324	4,094
Impairment charges			27,989	107,034
Depreciation and amortization	103,708	67,130	258,432	185,307
Total operating expenses	213,395	164,844	604,734	499,836
Operating income	74,987	90,390	261,165	229,548
Other income/(expense)
Mortgage financing income	445	417	2,497	2,544
Interest, dividends and other investment income	5,692	264	38,011	643
Other income/(expense), net	615	(1,397)	100	(4,307)
Interest expense	(54,031)	(51,225)	(162,739)	(153,936)
Income from continuing operations before income taxes, equity in income of joint ventures, gain on change in control of interests and equity in income from other real estate investments	27,708	38,449	139,034	74,492
Provision for income taxes, net	(2,844)	(5,252)	(11,933)	(14,693)
Equity in income of equity method investments, net			130,808	150,073
Income from continuing operations	53,419	105,451	435,288	310,049
Discontinued operations
Income/(loss) from discontinued operating properties, net of tax		6,715	(15)	31,552
Impairment/loss on operating properties, net of tax		(4,116)	(60)	(75,675)
Gain on disposition of operating properties, net of tax		89,259		118,804
Income/(loss) from discontinued operations		91,858	(75)	74,681
Gain on sale of operating properties, net of tax	27,665		86,219	389
Net income	81,084	197,309	521,432	385,119
Net income attributable to noncontrolling interests	(3,512)	(2,601)	(6,518)	(13,899)
Net income attributable to the Company	77,572	194,708	514,914	371,220
Preferred dividends	(14,573)	(14,573)	(43,719)	(43,720)
Net income available to the Company's common shareholders	$ 62,999	$ 180,135	$ 471,195	$ 327,500
Income from continuing operations:
-Basic (in Dollars per share)	$ 0.15	$ 0.21	$ 1.14	$ 0.63
-Diluted (in Dollars per share)	0.15	0.21	1.14	0.63
Net income attributable to the Company:
-Basic (in Dollars per share)	0.15	0.44	1.14	0.80
-Diluted (in Dollars per share)	$ 0.15	$ 0.44	$ 1.14	$ 0.80
Weighted average shares:
-Basic (in Shares)	411,487	409,326	411,202	408,868
-Diluted (in Shares)	412,686	411,101	413,262	410,687
Amounts attributable to the Company's common shareholders:
Income from continuing operations	$ 62,999	$ 88,275	$ 471,270	$ 260,246
Income/(loss) from discontinued operations		91,860	(75)	67,254
Gain on change in control of interests, net	6,342	14,431	146,143	83,773
Joint Ventures [Member]
Other income/(expense)
Equity in income of equity method investments, net	10,894	51,787	130,808	150,073
Other Real Estate Investments [Member]
Other income/(expense)
Equity in income of equity method investments, net	11,319	6,036	31,236	16,404
Continuing Operations [Member]
Operating expenses
Impairment charges	$ 6,058	$ 2,591	$ 27,908	$ 28,388