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Stockholders' Equity (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
 9 Months Ended 1 Months Ended 1 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Apr. 30, 2011
1996 Equity Compensation Plan [Member]
Apr. 30, 2011
2011 Equity Compensation Plan [Member]
Apr. 30, 2012
Restricted Stock [Member]
Feb. 29, 2012
Restricted Stock [Member]
Feb. 29, 2012
Minimum [Member]
Restricted Stock [Member]
Feb. 29, 2012
Maximum [Member]
Restricted Stock [Member]
Stockholders' Equity (Textual)                
Shares approved for grants         10,728 72,013    
Shares available for grant     350,000 300,000        
Vesting period, years         3 years   5 years 7 years
Closing price of stock on date of stock grant         $ 83.88 $ 115.55    
Common stock, shares authorized 20,000,000 20,000,000            
Common stock, par value $ 0.01 $ 0.01            
Common stock, shares issued 11,873,156 11,792,456            
Common stock, shares outstanding 11,873,156 11,792,456            
Preferred stock, shares authorized 8,000,000 8,000,000            
Preferred stock, shares issued                  
Preferred stock, shares outstanding                  
Annual cash dividends per share $ 4.00              
Quarterly cash dividends per share $ 1.00              
Maximum term of the awards granted under the Plan 10 years              
Stock-based compensation cost which has not yet been recognized $ 41.6              
Stock-based compensation cost recognized period, in months 60 months              
Restricted stock awarded subject to performance condition 230,000