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Stockholders' Equity, Dividends (Details) (USD $)
 6 Months Ended 23 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Common Class A [Member]
Jun. 30, 2013
Common Class A [Member]
Dec. 31, 2013
Common Class A [Member]
Jun. 30, 2014
Redeemable Convertible Series 6.3% Preferred Stock [Member]
Jun. 30, 2013
Redeemable Convertible Series 6.3% Preferred Stock [Member]
Dec. 31, 2013
Redeemable Convertible Series 6.3% Preferred Stock [Member]
Cash Dividends [Abstract]            
Cash dividends paid, net of reinvested stock dividends $ 2,525,000 $ 2,146,000        
Annualized dividend rate (in dollars per share) $ 0.543          
Preferred stock dividend rate percentage (in hundredths)       6.30%   6.30%
Cash dividends paid       54,000 54,000  
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