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 Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Consolidated Balance Sheets    
Accounts receivable, allowance for doubtful accounts (in dollars) $ 3,546 $ 2,796
Preferred Shares of beneficial interest, aggregate liquidation preference (in dollars) $ 216,333 $ 216,333
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 72,011,324 66,931,582
Common Shares of beneficial interest, shares outstanding 72,011,324 66,931,582