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Stockholders' Equity (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of authorized, outstanding preferred and common stock      
Common stock, shares authorized 20,000,000 20,000,000  
Common stock, shares outstanding 15,117,430 15,117,430 15,368,717
Common stock, par value $ 1.00 $ 1.00  
Common stock dividend payment terms As declared    
Common stock, voting rights Voting    
Senior Preferred Stock [Member]
      
Summary of authorized, outstanding preferred and common stock      
Preferred stock, shares authorized 10,000,000 10,000,000  
Preferred stock, shares outstanding         
Preferred stock, par value $ 1.00 $ 1.00  
Preferred stock, dividend payment terms As declared    
Preferred stock, voting rights Voting    
Cumulative Preferred Stock [Member]
      
Summary of authorized, outstanding preferred and common stock      
Preferred stock, shares authorized 900,000 900,000  
Preferred stock, shares outstanding         
Preferred stock, par value $ 5.00 $ 5.00  
Preferred stock, dividend payment terms As declared    
Preferred stock, voting rights Non-voting