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Stockholders' Equity, Common and Preferred Stock (Details) (USD $)
 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Common Class A [Member]
      
Common Stock [Abstract]      
Common stock, shares authorized (in shares)   100,000,000 100,000,000
Par value (in dollars per share)   $ 0.01 $ 0.01
Number of votes holder is entitled to   1  
Maximum individual common stock ownership (in hundredths)   9.80%  
Shares outstanding (in shares)   16,473,674 15,767,418
Common Class B [Member]
      
Common Stock [Abstract]      
Common stock, shares authorized (in shares)   1,000 1,000
Par value (in dollars per share)   $ 0.01 $ 0.01
Shares outstanding (in shares)   0 0
Preferred Stock [Member]
      
Preferred Stock [Abstract]      
Preferred shares authorized (in shares)   8,990,000  
Minimum number of series that can be issued   1  
Convertible Series AA Preferred Stock [Member]
      
Preferred Stock [Abstract]      
Preferred shares authorized (in shares)   1,000,000 1,000,000
Annual cash dividend rate (in hundredths)   7.00%  
Liquidation preference per share (in dollars per share)   $ 25 $ 25
Number of common shares received upon conversion (in shares)   2  
Preferred shares issued (in shares)   0 0
Redeemable Convertible Series 6.3% Preferred Stock [Member]
      
Preferred Stock [Abstract]      
Preferred shares authorized (in shares)   10,000 10,000
Annual cash dividend rate (in hundredths) 6.30% 6.30% 6.30%
Liquidation preference per share (in dollars per share)   $ 1,000 $ 1,000
Number of common shares received upon conversion (in shares)   116.28  
Preferred shares issued (in shares)   1,649 1,649
Annual cash dividend rate (in dollars per share) $ 63.00    
Total liquidation preference   $ 1,649,000  
Initial conversion price (in dollars per share)   $ 8.60  
Total number of common shares issuable upon conversion of outstanding shares of preferred stock (in shares)   191,755