Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues
Revenues from rental properties	$ 292,843	$ 287,115	$ 582,234	$ 580,206
Management and other fee income	4,333	4,373	8,530	8,484
Total revenues	297,176	291,488	590,764	588,690
Operating expenses
Rent	2,765	2,728	5,548	5,546
Real estate taxes	38,747	35,791	77,016	70,263
Operating and maintenance	35,435	33,223	69,665	67,776
General and administrative	27,233	29,928	57,807	61,857
Provision for doubtful accounts	2,096	1,185	3,500	4,660
Impairment charges			31,336	58,053
Depreciation and amortization	95,270	82,753	187,344	167,609
Total operating expenses	231,265	237,821	432,216	435,764
Operating income	65,911	53,667	158,548	152,926
Other income/(expense)
Other income/(expense), net	1,439	(1,012)	2,712	(1,182)
Interest expense	(46,090)	(50,479)	(92,572)	(102,930)
Income from continuing operations before income taxes, net, equity in income of joint ventures, net, gain on change in control of interests and equity in income from other real estate investments, net	21,260	2,176	68,688	48,814
Benefit/(provision) for income taxes, net	1,034	246	1,527	(11,866)
Gain on change in control of interests	60,972	46,512	71,160	46,512
Equity in income of joint ventures, net	13,200	108,700	27,902	178,618
Income from continuing operations	134,791	165,578	211,320	280,836
Gain on sale of operating properties, net of tax	19,883	39,268	21,569	66,164
Net income	154,674	204,846	232,889	347,000
Net income attributable to noncontrolling interests	(11,258)	(1,437)	(12,740)	(2,878)
Net income attributable to the Company	143,416	203,409	220,149	344,122
Preferred stock dividends	(11,555)	(11,555)	(23,110)	(23,110)
Net income available to the Company's common shareholders	$ 131,861	$ 191,854	$ 197,039	$ 321,012
Net income available to the Company:
-Basic (in dollars per share)	$ 0.31	$ 0.46	$ 0.46	$ 0.77
-Diluted (in dollars per share)	$ 0.31	$ 0.46	$ 0.46	$ 0.77
Weighted average shares:
-Basic (in shares)	423,650	417,748	423,516	415,189
-Diluted (in shares)	424,944	419,302	424,084	416,732
Joint Ventures [Member]
Other income/(expense)
Equity in income of joint ventures, net	$ 13,169	$ 108,685	$ 27,902	$ 178,618
Other Real Estate Investments [Member]
Other income/(expense)
Equity in income of joint ventures, net	38,356	7,959	42,043	18,758
Continuing Operations [Member]
Operating expenses
Impairment charges	$ 29,719	$ 52,213	$ 31,336	$ 58,053