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Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Thousands, $ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Rents and other receivables, allowance for doubtful accounts $ 2,297 $ 3,392
Preferred shares, par value $ 0.01 $ 0.01
Preferred shares, shares authorized 10,000 10,000
Preferred shares, shares issued 0 0
Preferred shares, shares outstanding 0 0
Shares of beneficial interest, shares issued 68,191 67,819
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 outstanding 68,191 67,819