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Shareholders' Equity (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 3 Months Ended 3 Months Ended 0 Months Ended
Mar. 31, 2014
Jan. 13, 2014
Mar. 31, 2014
Series B [Member]
Mar. 31, 2013
Series B [Member]
Dec. 31, 2013
Series B [Member]
Mar. 31, 2014
Series A [Member]
Mar. 31, 2013
Series A [Member]
Apr. 24, 2014
Subsequent Event [Member]
Apr. 24, 2014
Subsequent Event [Member]
Series B [Member]
Class of Stock [Line Items]                  
Public offering, shares   6,900,000              
Shares issued to underwriters   900,000              
Dividend rate percentage     7.25% 7.25%   8.875% 8.875%    
Public offering, realized net proceeds, net offering expenses   $ 41.3              
At-the-market program, shares authorized 10,000,000                
At-the-market program, shares sold 0                
Liquidation preference, per share     $ 25.00   $ 25.00        
Common stock, dividends declared               $ 0.05  
Preferred stock dividends declared                 $ 0.453125
Dividends payable, date declared Apr. 24, 2014                
Dividends payable, date to be paid May 20, 2014                
Dividends payable, date of record May 09, 2014