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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 9 Months Ended 1 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Feb. 28, 2013
Board of Directors [Member]
May 31, 2013
Restricted Stock [Member]
Mar. 31, 2013
Restricted Stock [Member]
Feb. 28, 2013
Restricted Stock [Member]
May 31, 2013
Restricted Stock [Member]
Non-employee [Member]
Sep. 30, 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         43,659   165,712 16,370      
Vesting period, years       2 years 4 years     3 years   3 years 5 years
Closing price of stock on date of stock grant             $ 62.28 $ 45.81      
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 10,852,020   11,387,299                
Common stock, shares outstanding 10,852,020   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 $ 40.2                    
Stock-based compensation cost recognized period, in months 55 months                    
Tax shortfall related to share-based payment arrangements $ 3.5 $ 0.4                  
Restricted stock awarded subject to performance condition 344,000