Equity (Details Textual) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Jan. 30, 2015
Stockholders Equity [Line Items]
Preferred Stock Dividend Rate Percentage	8.00%		8.00%
Operating Partnership Units Outstanding	75.5
Accrued Dividends Common Stock		$ 10.7
Dividend Declared Per Preferred Share		$ 0.50
Accrued Dividends Preferred Stock		$ 2.5
Preferred stock, liquidation preference per share	$ 25		$ 25
Limited Partnership Units Of Operating Partnership Units Issued				10.4
Board Of Directors [Member]
Stockholders Equity [Line Items]
Dividend Declared Per Common Share and Operating Partnership Unit		$ 0.165
Parent Company [Member]
Stockholders Equity [Line Items]
Operating Partnership Units Outstanding	64.7
Percentage Of Operating Partnership Units Held	85.70%
Other Partners [Member]
Stockholders Equity [Line Items]
Operating Partnership Units Outstanding	10.8
Percentage Of Operating Partnership Units Held	14.30%
Fair Market Value Of Operating Partnership Units	$ 77.0
Per Unit Fair Market Value Of Operating Partnership Units	$ 7.16
8% Series A Cumulative Redeemable Preferred Stock [Member]
Stockholders Equity [Line Items]
Preferred Stock Dividend Rate Percentage	8.00%
Preferred stock, liquidation preference per share	$ 25.00
Preferred Stock Dividend Rate Per Dollar Amount	2.00
Preferred Stock Redemption Price Per Share	$ 25.00