Consolidated Statements of Equity (Parenthetical) (Accumulated Distributions in Excess of Net Income [Member], USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Dividends declared on Common Shares of Beneficial Interest	$ 0.325	$ 0.325
Series D Preferred Shares of Beneficial Interest [Member]
Dividends declared on Series D Preferred Shares	$ 1.15625	$ 1.15625