CONSOLIDATED STATEMENTS OF EQUITY AND COMPREHENSIVE INCOME (Unaudited) (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Dividends and Distributions declared:
Common Stock, Dividends declared (in dollars per share)	$ 0.17	$ 0.15
Common Units, Distributions declared (in dollars per share)	$ 0.17	$ 0.15
Series A Preferred Stock [Member]
Dividends and Distributions declared:
Preferred Stock, Dividends declared (in dollars per share)	$ 1.50	$ 1.50
Series B Preferred Stock [Member]
Dividends and Distributions declared:
Preferred Stock, Dividends declared (in dollars per share)	$ 0.74