Subsequent Events Series B Preferred Stock Offering (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Apr. 19, 2013	Dec. 31, 2012
Subsequent Event [Line Items]
Preferred Stock, Shares Issued		2,300,000		2,300,000
Preferred Stock, Dividend Rate, Percentage	7.625%	8.50%
Preferred Stock, Par Value Per Share		$ 0.01	$ 0.01	$ 0.01
Preferred Stock, Liquidation Preference Per Share			$ 25.00
Preferred Stock, Including Additional Paid in Capital, Net of Discount			$ 54,478
Series B Preferred Stock [Member]
Subsequent Event [Line Items]
Preferred Stock, Shares Issued			2,250,000
Preferred Shares Issued, Underwriters' Option [Member]
Subsequent Event [Line Items]
Preferred Stock, Shares Issued			250,000