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 Per Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Statement of Financial Position [Abstract]    
Rents and other receivables, allowance for doubtful accounts $ 9,544 $ 10,958
Preferred Stock, Par or Stated Value Per Share (in dollars per share) $ 0.01 $ 0.01
Preferred Stock, Shares Authorized (in shares) 10,000 10,000
Preferred Stock, Shares Issued (in shares) 0 0
Preferred Stock, Shares Outstanding (in shares) 0 0
Shares of beneficial interest, par value (in dollars per share) $ 0.01 $ 0.01
Shares of beneficial interest, shares authorized (in shares) 100,000 100,000
Shares of beneficial interest, shares issued (in shares) 66,485 66,437
Shares of beneficial interest, shares outstanding (in shares) 66,485 66,437