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Stockholders' Equity, Dividends (Details) (USD $)
 3 Months Ended 23 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Common Class A [Member]
      
Cash Dividends [Abstract]      
Cash dividends paid, net of reinvested stock dividends $ 1,250,000 $ 1,137,000  
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 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
Redeemable Convertible Series 6.3% Preferred Stock [Member]
      
Cash Dividends [Abstract]      
Cash dividends paid $ 27,000 $ 27,000