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Consolidated Balance Sheets (Parenthetical - REIT) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Receivables:
Tenant receivables allowance for doubtful accounts	$ 2,368us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables	$ 2,379us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables
Other receivables allowance for doubtful accounts	$ 1,285us-gaap_AllowanceForDoubtfulOtherReceivablesCurrent	$ 1,241us-gaap_AllowanceForDoubtfulOtherReceivablesCurrent
Shareholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.01us-gaap_PreferredStockParOrStatedValuePerShare	$ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized	15,000,000us-gaap_PreferredStockSharesAuthorized	15,000,000us-gaap_PreferredStockSharesAuthorized
Common stock, par value (in dollars per share)	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized	350,000,000us-gaap_CommonStockSharesAuthorized	350,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	170,260,273us-gaap_CommonStockSharesIssued	170,048,144us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	170,260,273us-gaap_CommonStockSharesOutstanding	170,048,144us-gaap_CommonStockSharesOutstanding
Series D Preferred Stock [Member]
Shareholders' equity:
Preferred stock, dividend rate (percent)	7.375%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember	7.375%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember
Preferred stock, shares outstanding	1,815,000us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember	1,815,000us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember
Series E Preferred Stock [Member]
Shareholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.01us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember	$ 0.01us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember
Preferred stock, dividend rate (percent)	6.625%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember	6.625%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember
Preferred stock, shares outstanding	690,000us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember	690,000us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember

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