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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 4,193 $ 3,546
Preferred Shares of beneficial interest, par value (in dollars per share) $ 0.01 $ 0.01
Preferred Shares of beneficial interest, shares authorized 25,000,000 15,000,000
Preferred Shares of beneficial interest, shares issued 15,021,667 8,121,667
Preferred Shares of beneficial interest, shares outstanding 15,021,667 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 72,084,932 72,011,324
Common Shares of beneficial interest, shares outstanding 72,084,932 72,011,324