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Stockholders' Equity, Dividends (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Common Class A [Member]
    
Cash Dividends [Abstract]    
Cash dividends paid, net of reinvested stock dividends $ 4,578,000 $ 4,262,000
Annualized dividend rate (in dollars per share) $ 0.543  
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 Reinvesment Plan 30 days  
Common stock issued under dividend reinvestment plan 7,900,000  
Common stock issued under dividend reinvestment plan (in shares) 836,000  
Redeemable Convertible Series 6.3% Preferred Stock [Member]
    
Cash Dividends [Abstract]    
Cash dividends paid $ 105,000