Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Statement of Financial Position [Abstract]    
Rents and other receivables, allowance for doubtful accounts $ 6,783 $ 10,443
Preferred shares, par value $ 0.01 $ 0.01
Preferred shares, shares authorized 10,000 10,000
Preferred shares, shares issued 0 0
Preferred shares, shares outstanding 0 0
Shares of beneficial interest, par value $ 0.01 $ 0.01
Shares of beneficial interest, shares authorized 100,000 100,000
Shares of beneficial interest, shares issued 66,531 66,437
Shares of beneficial interest, shares outstanding 66,531 66,437