Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Rents and other receivables, allowance for doubtful accounts $ 2,274 $ 2,377
Preferred shares, par value (in dollars per share) $ 0.01 $ 0.01
Preferred shares, shares authorized (in shares) 10,000,000 10,000,000
Preferred shares, shares issued (in shares) 0 0
Preferred shares, shares outstanding (in shares) 0 0
Shares of beneficial interest, par value (in dollars per share) $ 0.01 $ 0.01
Shares of beneficial interest, shares authorized (in shares) 100,000,000 100,000,000
Shares of beneficial interest, shares issued (in shares) 76,926,000 74,606,000
Shares of beneficial interest, shares outstanding (in shares) 76,926,000 74,606,000