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Stockholders' Equity, Dividends (Details) (USD $)
 9 Months Ended 23 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Common Stock Series A [Member]
Sep. 30, 2013
Common Stock Series A [Member]
Dec. 31, 2013
Common Stock Series A [Member]
Aug. 31, 2014
Convertible Series 6.3% Preferred Stock [Member]
Sep. 30, 2014
Convertible Series 6.3% Preferred Stock [Member]
Sep. 30, 2014
Convertible Series 6.3% Preferred Stock [Member]
Dec. 31, 2013
Convertible Series 6.3% Preferred Stock [Member]
Cash Dividends [Abstract]                
Cash dividends paid, net of reinvested stock dividends   $ 3,830,000 $ 3,345,000          
Annualized dividend rate (in dollars per share)   $ 0.543            
Preferred stock, dividend rate percentage (in hundredths)           6.30% 6.30% 6.30%
Cash dividends paid             77,000  
Convertible series 6.3% preferred stock redeemed 1,649,266       1,600,000      
Dividend Reinvestment Plan [Abstract]                
Registered shares of common stock pursuant to dividend reinvestment plan (in shares)   1,500,000            
Percentage of purchase price per share (in hundredths)   95.00%            
Former sales price per share (in dollars per share)   $ 9.50            
Notice period for amendments to Dividend Reinvestment Plan   30 days            
Common stock issued under dividend reinvestment plan       $ 7,900,000        
Common stock issued under dividend reinvestment plan (in shares)       836,000