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Stockholders' Equity (Common and Preferred Stock) (Details)
 12 Months Ended
Dec. 31, 2018
Vote
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2011
$ / shares
shares
Private Placement [Member]      
Common Stock [Abstract]      
Common stock shares issued (in shares)     20,000,000
Sale of Stock, Price Per Share | $ / shares     $ 10
Sale Of Stock Nature Of Consideration Received Per Transaction The Company ceased raising capital under this private placement offering effective December 31, 2011.    
Preferred Stock [Member]      
Preferred Stock [Abstract]      
Preferred shares authorized (in shares) 8,990,000    
Preferred shares issued (in shares) 0    
Convertible Series AA Preferred Stock [Member]      
Preferred Stock [Abstract]      
Preferred shares authorized (in shares) 1,000,000    
Annual cash dividend rate (in hundredths) 7.00%    
Liquidation preference per share (in dollars per share) | $ / shares $ 25.00    
Initial conversion price (in dollars per share) | $ / shares $ 25.00    
Total number of common shares issuable upon conversion of outstanding shares of preferred stock (in shares) 2    
Preferred shares issued (in shares) 0    
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) | $ / shares $ 0.01 $ 0.01  
Common stock shares issued (in shares) 17,721,422 17,667,857  
Number of votes holder is entitled to | Vote 1    
Maximum individual common stock ownership (in hundredths) 9.80%    
Common Class B [Member]      
Common Stock [Abstract]      
Common stock, shares authorized (in shares) 1,000    
Par value (in dollars per share) | $ / shares $ 0.01    
Common stock shares issued (in shares) 0    
Number of votes holder is entitled to | Vote 1    
Maximum individual common stock ownership (in hundredths) 9.80%