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Shareholders' Equity (Narrative) (Details) - USD ($)
9 Months Ended
Oct. 20, 2015
Jan. 12, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Class of Stock [Line Items]          
Public offering, realized net proceeds, net offering expenses   $ 41,900,000 $ 41,686,000 $ 41,182,000  
Public offering, shares   5,750,000 85,050,000   79,213,000
Shares issued to underwriters   750,000      
At-the-market program, shares sold     0    
Dividends payable, date declared     Oct. 20, 2015    
Dividends payable, date to be paid     Nov. 20, 2015    
Dividends payable, date of record     Nov. 10, 2015    
Subsequent Event [Member]          
Class of Stock [Line Items]          
Common stock, dividends declared $ 0.05        
Subsequent Event [Member] | Series B [Member]          
Class of Stock [Line Items]          
Preferred stock dividends declared $ 0.453125