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
Jun. 30, 2012
Dec. 31, 2011
Statement of Financial Position [Abstract]    
Rents and other receivables, allowance for doubtful accounts $ 10,416 $ 8,921
Preferred Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Preferred Stock, Shares Authorized 10,000 10,000
Preferred Stock, Shares Issued 0 0
Preferred Stock, 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 66,323 66,265
Shares of beneficial interest, shares outstanding 66,321 66,265