Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Revenues from rental properties	$ 958,888us-gaap_RealEstateRevenueNet	$ 825,210us-gaap_RealEstateRevenueNet	$ 755,851us-gaap_RealEstateRevenueNet
Management and other fee income	35,009us-gaap_ManagementFeesRevenue	36,317us-gaap_ManagementFeesRevenue	37,522us-gaap_ManagementFeesRevenue
Total revenues	993,897us-gaap_Revenues	861,527us-gaap_Revenues	793,373us-gaap_Revenues
Operating expenses
Rent	14,250	13,347	12,745
Real estate taxes	124,670us-gaap_RealEstateTaxExpense	108,746us-gaap_RealEstateTaxExpense	101,820us-gaap_RealEstateTaxExpense
Operating and maintenance	119,697us-gaap_OtherCostAndExpenseOperating	99,405us-gaap_OtherCostAndExpenseOperating	92,409us-gaap_OtherCostAndExpenseOperating
General and administrative expenses	122,201us-gaap_GeneralAndAdministrativeExpense	127,470us-gaap_GeneralAndAdministrativeExpense	123,524us-gaap_GeneralAndAdministrativeExpense
Provision for doubtful accounts	4,882us-gaap_ProvisionForDoubtfulAccounts	6,133us-gaap_ProvisionForDoubtfulAccounts	4,843us-gaap_ProvisionForDoubtfulAccounts
Impairment charges	217,858us-gaap_AssetImpairmentCharges	190,218us-gaap_AssetImpairmentCharges	59,569us-gaap_AssetImpairmentCharges
Depreciation and amortization	258,074us-gaap_DepreciationAndAmortization	224,713us-gaap_DepreciationAndAmortization	214,827us-gaap_DepreciationAndAmortization
Total operating expenses	683,582us-gaap_OperatingExpenses	612,061us-gaap_OperatingExpenses	560,457us-gaap_OperatingExpenses
Operating income	310,315us-gaap_OperatingIncomeLoss	249,466us-gaap_OperatingIncomeLoss	232,916us-gaap_OperatingIncomeLoss
Other income/(expense)
Mortgage financing income	3,129us-gaap_OtherRealEstateRevenue	4,304us-gaap_OtherRealEstateRevenue	7,504us-gaap_OtherRealEstateRevenue
Interest, dividends and other investment income	966us-gaap_InvestmentIncomeNet	16,847us-gaap_InvestmentIncomeNet	2,022us-gaap_InvestmentIncomeNet
Other (expense)/income, net	(8,544)us-gaap_OtherNonoperatingIncomeExpense	1,195us-gaap_OtherNonoperatingIncomeExpense	(6,949)us-gaap_OtherNonoperatingIncomeExpense
Interest expense	(203,759)us-gaap_InterestExpense	(212,240)us-gaap_InterestExpense	(223,736)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	102,107	59,572	11,757
Provision for income taxes, net	(22,438)us-gaap_IncomeTaxExpenseBenefit	(32,654)us-gaap_IncomeTaxExpenseBenefit	(15,603)us-gaap_IncomeTaxExpenseBenefit
Equity in income of equity method investments, net	159,560	208,689	112,896
Income from continuing operations	384,506	288,454	178,002
Gain on change in control of interests, net	107,235	21,711	15,555
Discontinued operations
Income from discontinued operating properties, net of tax	36,780	50,610	53,153
Impairment/loss on operating properties, net of tax	(176,315)	(143,057)	(38,432)
Gain on disposition of operating properties, net of tax	190,520	43,914	83,253
Income/(loss) from discontinued operations	50,985	(48,533)	97,974
Gain on sale of operating properties, net of tax	389	1,432	4,299
Net income	435,880us-gaap_ProfitLoss	241,353us-gaap_ProfitLoss	280,275us-gaap_ProfitLoss
Net income attributable to noncontrolling interests	(11,879)	(5,072)	(14,202)
Net income attributable to the Company	424,001us-gaap_NetIncomeLoss	236,281us-gaap_NetIncomeLoss	266,073us-gaap_NetIncomeLoss
Preferred stock redemption costs			(21,703)us-gaap_PreferredStockRedemptionPremium
Preferred dividends	(58,294)us-gaap_DividendsPreferredStock	(58,294)us-gaap_DividendsPreferredStock	(71,697)us-gaap_DividendsPreferredStock
Net income available to the Company's common shareholders	365,707	177,987	172,673
Income from continuing operations:
-Basic (in Dollars per share)	$ 0.77	$ 0.53	$ 0.19
-Diluted (in Dollars per share)	$ 0.77	$ 0.53	$ 0.19
Net income attributable to the Company:
-Basic (in Dollars per share)	$ 0.89us-gaap_EarningsPerShareBasic	$ 0.43us-gaap_EarningsPerShareBasic	$ 0.42us-gaap_EarningsPerShareBasic
-Diluted (in Dollars per share)	$ 0.89us-gaap_EarningsPerShareDiluted	$ 0.43us-gaap_EarningsPerShareDiluted	$ 0.42us-gaap_EarningsPerShareDiluted
Weighted average shares:
-Basic (in Shares)	409,088	407,631	405,997
-Diluted (in Shares)	411,038	408,614	406,689
Amounts attributable to the Company's common shareholders:
Income from continuing operations	316,839	218,590	79,360
Income/(loss) from discontinued operations	48,868	(40,603)	93,313
Joint Ventures [Member]
Other income/(expense)
Equity in income of equity method investments, net	159,560	208,689	112,896
Other Real Estate Investments [Member]
Other income/(expense)
Equity in income of equity method investments, net	38,042	31,136	53,397
Continuing Operations [Member]
Operating expenses
Impairment charges	$ 39,808	$ 32,247	$ 10,289

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