Equity (Details Textual) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	0 Months Ended	1 Months Ended	6 Months Ended		1 Months Ended
	Feb. 09, 2012	Jul. 31, 2012	Jun. 30, 2012	Jun. 13, 2012	Feb. 29, 2012 8% Series A Cumulative Redeemable Preferred Stock [Member]	Feb. 09, 2012 8% Series A Cumulative Redeemable Preferred Stock [Member]	Jun. 30, 2012 Parent Company [Member]	Jun. 30, 2012 Other Partners [Member]	Jun. 13, 2012 Board Of Directors [Member]
Preferred Stock Underwritten Public Offerings						2.3
Preferred Stock, Dividend Rate, Percentage			8.00%		8.00%
Stock Issued During Period, Shares, New Issues					0.3
Preferred Stock Public Offering Price						$ 25
Proceeds from Issuance of Redeemable Preferred Stock					$ 55,000,000
Operating Partnership Units Outstanding			31.5				31.1	0.4
Percentage Of Operating Partnership Units Held							98.60%	1.40%
Per Unit Fair Market Value Of Operating Partnership Units								$ 10.39
Fair Market Value Of Operating Partnership Units								4,500,000
Stock Issued During Period Shares In Underwritten Public Offering		7.5
Dividend Declared Per Common Share and Operating Partnership Unit									$ 0.16
Accrued Dividends Common Stock			5,000,000
Dividend Declared Per Preferred Share				$ 0.50
Accrued Dividends Preferred Stock			1,000,000
Preferred Stock Per Share Issue Price	25.00
Stock Issued During Period, Value, New Issues	54,900,000		54,893,000
Repayments of Long-term Debt	$ 48,900,000