Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts - AR $ 2,353 $ 2,976
Allowance - Deferred rent receivable $ 1,495 $ 2,126
Preferred Shares of beneficial interest, par value (in dollars per share) $ 0.01 $ 0.01
Preferred Shares of beneficial interest, shares authorized 25,000,000 25,000,000
Preferred Shares of beneficial interest, shares issued 9,431,667 9,431,667
Preferred Shares of beneficial interest, shares outstanding 9,431,667 9,431,667
Common Shares of beneficial interest, par value (in dollars per share) $ 0.01 $ 0.01
Common Shares of beneficial interest, shares authorized 125,000,000 125,000,000
Common Shares of beneficial interest, shares issued 87,594,931 87,394,512
Common Shares of beneficial interest, shares outstanding 87,594,931 87,394,512