Beneficial Interest (Details) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Beneficial Interest (Textual) [Abstract]
Common Shares, outstanding	5,086,674	0	3,796,223
Preferred Shares, outstanding	0		0
Dividends paid	$ 0.61950	$ 0.60375
Beneficial Interest [Member]
Class of Stock [Line Items]
Common shares, authorized	100,000,000
Common shares, par value	$ 0.01
Preferred shares , authorized	50,000,000
Preferred shares, par value	$ 0.01