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Stockholders' Equity (Details Textual) (USD $)
 3 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Feb. 28, 2013
Board of Directors [Member]
Mar. 31, 2013
Board of Directors [Member]
Mar. 31, 2013
Restricted Stock [Member]
Feb. 28, 2013
Restricted Stock [Member]
Mar. 31, 2013
Stock Option [Member]
Feb. 28, 2013
Minimum [Member]
Restricted Stock [Member]
Feb. 28, 2013
Maximum [Member]
Restricted Stock [Member]
Stock Options and Restricted Stock (Textual)                    
Shares approved for grants             165,712      
Vesting period, years         2 years       3 years 5 years
Closing price of stock on date of stock grant             $ 62.28      
Restricted shares converted to restricted stock units           200,000        
Options granted to purchase common stock       100,000            
Options granted to purchase common stock, exercise price       $ 51.95            
Awards expiration period, years         8 years          
Weighted average fair value of the options granted per share               $ 22.09    
Stock options risk-free interest rate               0.877%    
Stock options expected life               5 years    
Stock options volatility rate               48.49%    
Stock options dividend yield               0.00%    
Common stock, shares authorized 20,000,000   20,000,000              
Common stock, par value $ 0.01   $ 0.01              
Common stock, shares issued 10,810,872   11,387,299              
Common stock, shares outstanding 10,810,872   11,387,299              
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 $ 44,400,000                  
Stock-based compensation cost recognized period, in months 60 months                  
Tax shortfall related to share-based payment arrangements $ (3,286,000) $ (740,000)                
Restricted stock awarded subject to performance condition 344,000