Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenues
Revenues from rental properties	$ 275,506us-gaap_RealEstateRevenueNet	$ 219,152us-gaap_RealEstateRevenueNet
Management and other fee income	7,950us-gaap_ManagementFeesRevenue	9,041us-gaap_ManagementFeesRevenue
Total revenues	283,456us-gaap_Revenues	228,193us-gaap_Revenues
Operating expenses
Rent	3,554	3,305
Real estate taxes	36,072us-gaap_RealEstateTaxExpense	29,350us-gaap_RealEstateTaxExpense
Operating and maintenance	33,902us-gaap_OtherCostAndExpenseOperating	26,076us-gaap_OtherCostAndExpenseOperating
General and administrative expenses	32,705us-gaap_GeneralAndAdministrativeExpense	37,121us-gaap_GeneralAndAdministrativeExpense
Provision for doubtful accounts	2,297us-gaap_ProvisionForDoubtfulAccounts	1,452us-gaap_ProvisionForDoubtfulAccounts
Impairment charges	6,473us-gaap_AssetImpairmentCharges	6,893us-gaap_AssetImpairmentCharges
Depreciation and amortization	74,569us-gaap_DepreciationAndAmortization	56,060us-gaap_DepreciationAndAmortization
Total operating expenses	189,490us-gaap_OperatingExpenses	153,525us-gaap_OperatingExpenses
Operating income	93,966us-gaap_OperatingIncomeLoss	74,668us-gaap_OperatingIncomeLoss
Other income/(expense)
Mortgage financing income	1,136us-gaap_OtherRealEstateRevenue	1,699us-gaap_OtherRealEstateRevenue
Interest, dividends and other investment income	217us-gaap_InvestmentIncomeNet	53us-gaap_InvestmentIncomeNet
Other expense, net	(985)us-gaap_OtherNonoperatingIncomeExpense	(2,424)us-gaap_OtherNonoperatingIncomeExpense
Interest expense	(52,578)us-gaap_InterestExpense	(50,243)us-gaap_InterestExpense
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	41,756	23,753
Provision for income taxes, net	(12,717)us-gaap_IncomeTaxExpenseBenefit	(8,515)us-gaap_IncomeTaxExpenseBenefit
Equity in income of equity method investments, net	97,550	53,261
Income from continuing operations	280,759	75,596
Discontinued operations
(Loss)/income from discontinued operating properties, net of tax	(15)	16,435
Impairment/loss on operating properties, net of tax	(60)	(5,508)
Gain on disposition of operating properties, net of tax		9,337
(Loss)/income from discontinued operations	(75)	20,264
Gain on sale of operating properties	32,055
Net income	312,739us-gaap_ProfitLoss	95,860us-gaap_ProfitLoss
Net income attributable to noncontrolling interests	(2,397)	(8,860)
Net income attributable to the Company	310,342us-gaap_NetIncomeLoss	87,000us-gaap_NetIncomeLoss
Preferred dividends	(14,573)us-gaap_DividendsPreferredStock	(14,573)us-gaap_DividendsPreferredStock
Net income available to the Company's common shareholders	295,769	72,427
Per common share:
-Basic (in Dollars per share)	$ 0.72	$ 0.14
-Diluted (in Dollars per share)	$ 0.71	$ 0.14
-Basic (in Dollars per share)	$ 0.72us-gaap_EarningsPerShareBasic	$ 0.18us-gaap_EarningsPerShareBasic
-Diluted (in Dollars per share)	$ 0.71us-gaap_EarningsPerShareDiluted	$ 0.18us-gaap_EarningsPerShareDiluted
-Basic (in Shares)	410,433	408,367
-Diluted (in Shares)	415,396	409,444
Amounts attributable to the Company's common shareholders:
Income from continuing operations	295,844	58,776
(Loss)/income from discontinued operations	(75)	13,651
Gain on change in control of interests, net	139,801	3,744
Joint Ventures [Member]
Other income/(expense)
Equity in income of equity method investments, net	97,550	53,261
Other Real Estate Investments [Member]
Other income/(expense)
Equity in income of equity method investments, net	14,369	3,353
Continuing Operations [Member]
Operating expenses
Impairment charges	$ 6,391	$ 161

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