CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement Of Financial Position [Abstract]
Intangible assets, accumulated amortization	$ 25,100	$ 19,700
Mortgage and other notes payable, non-recourse to us, debt premium	$ 298	$ 523
Preferred shares of beneficial interest, par value	$ 0.01	$ 0.01
Preferred shares of beneficial interest, shares authorized	5,000,000	5,000,000
Preferred shares of beneficial interest, issued	0	0
Preferred shares of beneficial interest, outstanding	0	0
Common shares, par value	$ 0.01	$ 0.01
Common shares, shares authorized	95,000,000	95,000,000
Common shares, issued	13,327,020	13,301,204
Common shares, outstanding	13,327,020	13,301,204