Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Condensed Consolidated Balance Sheets [Abstract]
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, shares issued	0	0
Preferred shares of beneficial interest, shares outstanding	0	0
Common shares, par value	$ 0.01	$ 0.01
Common shares, shares authorized	95,000,000	95,000,000
Common shares, shares issued	12,665,269	12,653,169
Common shares, shares outstanding	12,665,269	12,653,169