CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Rents receivable, allowance for doubtful accounts (in dollars)	$ 7,451	$ 7,885
Common shares of beneficial interest, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares of beneficial interest, shares authorized	350,000,000	350,000,000
Common shares of beneficial interest, shares issued	128,859,923	118,386,918
Common shares of beneficial interest, shares outstanding	128,859,923	118,386,918
Series D
Preferred shares of beneficial interest, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred shares of beneficial interest, shares authorized	50,000,000	50,000,000
Preferred shares, dividend yield (as a percent)	6.50%	6.50%
Preferred shares of beneficial interest, shares issued	4,916,997	15,180,000
Preferred shares of beneficial interest, shares outstanding	4,916,997	15,180,000
Preferred shares, aggregate liquidation preference (in dollars)	122,925	379,500
Series E
Preferred shares of beneficial interest, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred shares of beneficial interest, shares authorized	50,000,000	50,000,000
Preferred shares, dividend yield (as a percent)	7.25%	7.25%
Preferred shares of beneficial interest, shares issued	11,000,000	11,000,000
Preferred shares of beneficial interest, shares outstanding	11,000,000	11,000,000
Preferred shares, aggregate liquidation preference (in dollars)	$ 275,000	$ 275,000