Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Continuing Operations [Member]
Operating expenses
Asset Impairment Charges	$ 52,213	$ 15,459	$ 58,053	$ 21,850
Joint Ventures [Member]
Other income/(expense)
Equity in income of joint ventures, net	108,685	22,364	178,618	119,914
Other Real Estate Investments [Member]
Operating expenses
Asset Impairment Charges				4,000
Other income/(expense)
Equity in income of joint ventures, net	7,959	5,548	18,758	19,917
Revenues from rental properties	287,115	289,080	580,206	564,586
Management and other fee income	4,373	4,981	8,484	12,931
Total revenues	291,488	294,061	588,690	577,517
Rent	2,728	3,012	5,546	6,566
Real estate taxes	35,791	36,700	70,263	72,772
Operating and maintenance	33,223	36,109	67,776	70,011
General and administrative expenses	29,928	29,307	61,857	62,012
Provision for doubtful accounts	1,185	1,107	4,660	3,404
Asset Impairment Charges			58,053	21,931
Depreciation and amortization	82,753	80,155	167,609	154,724
Total operating expenses	237,821	201,849	435,764	391,339
Operating income	53,667	92,212	152,926	186,178
Mortgage financing income	414	916	824	2,052
Interest, dividends and other investment income	644	32,102	350	32,319
Other (expense)/income, net	(2,070)	470	(2,356)	(515)
Interest expense	(50,479)	(56,130)	(102,930)	(108,708)
Income from continuing operations before income taxes, equity in income of joint ventures, gain on change in control of interests and equity in income of other real estate investments	2,176	69,570	48,814	111,326
Benefit/(provision) for income taxes, net	246	3,628	(11,866)	(9,089)
Equity in income of joint ventures, net	108,700	22,400	178,618	119,914
Gain on change in control of interests, net	46,512		46,512	139,801
Income from continuing operations	165,578	101,110	280,836	381,869
Discontinued operations
Loss from discontinued operating properties, net of tax				(15)
Impairment/loss on operating properties, net of tax				(60)
Loss from discontinued operations				(75)
Gain on sale of operating properties, net of tax	39,268	26,499	66,164	58,554
Net income	204,846	127,609	347,000	440,348
Net income attributable to noncontrolling interests	(1,437)	(609)	(2,878)	(3,006)
Net income attributable to the Company	203,409	127,000	344,122	437,342
Preferred dividends	(11,555)	(14,573)	(23,110)	(29,146)
Net income available to the Company's common shareholders	$ 191,854	$ 112,427	$ 321,012	$ 408,196
-Basic (in dollars per share)	$ 0.46	$ 0.27	$ 0.77	$ 0.99
-Diluted (in dollars per share)	0.46	0.27	0.77	0.98
Net income attributable to the Company:
-Basic (in dollars per share)	0.46	0.27	0.77	0.99
-Diluted (in dollars per share)	$ 0.46	$ 0.27	$ 0.77	$ 0.98
Weighted average shares:
-Basic (in shares)	417,748	411,317	415,189	411,057
-Diluted (in shares)	419,302	413,086	416,732	413,148
Income from continuing operations	$ 191,854	$ 112,427	$ 321,012	$ 408,271
Loss from discontinued operations				(75)
Net income	$ 191,854	$ 112,427	$ 321,012	$ 408,196