Subsequent Events Series B Preferred Stock Offering (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Series B Preferred Stock [Member]
Subsequent Event [Line Items]
Preferred Stock, Shares Issued	2,250,000	0
Preferred Stock, Dividend Rate, Percentage	7.625%
Preferred Stock, Par Value Per Share	$ 0.01	$ 0
Preferred Stock, Liquidation Preference Per Share	$ 25.00
Preferred Stock, Including Additional Paid in Capital, Net of Discount	$ 54,478
Preferred Shares Issued, Underwriters' Option [Member]
Subsequent Event [Line Items]
Preferred Stock, Shares Issued	250,000