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
Sep. 30, 2011
Dec. 31, 2010
Consolidated Balance Sheets    
Accounts receivable, allowance for doubtful accounts (in dollars) $ 3,404 $ 2,796
Preferred Shares of beneficial interest, aggregate liquidation preference (in dollars) $ 216,333 $ 216,333
Preferred Shares of beneficial interest, par value (in dollars per share) $ 0.01 $ 0.01
Preferred Shares of beneficial interest, shares authorized 15,000,000 15,000,000
Preferred Shares of beneficial interest, shares issued 8,121,667 8,121,667
Preferred Shares of beneficial interest, shares outstanding 8,121,667 8,121,667
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 71,986,936 66,931,582
Common Shares of beneficial interest, shares outstanding 71,986,936 66,931,582