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Share-Based Compensation (Details 2) (USD $)
 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Stock option
Jun. 30, 2012
Stock option
Jun. 30, 2011
Stock option
Jun. 30, 2012
RSUs
Jun. 30, 2011
RSUs
Jun. 30, 2012
RSUs
Jun. 30, 2011
RSUs
Jun. 30, 2012
Directors and employees
Stock option
Jun. 30, 2011
Directors and employees
Stock option
Jun. 30, 2012
Directors and employees
Stock option
Jun. 30, 2011
Directors and employees
Stock option
Jun. 30, 2012
Director
Stock option
Feb. 29, 2012
2003 Incentive Plan
Chairman, Chief Executive Officer, and President
Common Stock
Jun. 30, 2012
2003 Incentive Plan
Chairman, Chief Executive Officer, and President
Common Stock
Jun. 30, 2011
2003 Incentive Plan
Chairman, Chief Executive Officer, and President
Common Stock
Jun. 30, 2012
2003 Incentive Plan
Chairman, Chief Executive Officer, and President
Common Stock
Jun. 30, 2011
2003 Incentive Plan
Chairman, Chief Executive Officer, and President
Common Stock
Shares under options                                          
Outstanding at the beginning of the period (in shares)           638,521                              
Granted (in shares)           7,770                   7,770          
Exercised (in shares)           (118,870)                              
Cancelled or expired (in shares)           (11,250)                              
Outstanding at the end of the period (in shares)         516,171 516,171                              
Options exercisable at the end of the period (in shares)         479,921 479,921                              
Vested and expected to vest at the end of the period (in shares)         516,171 516,171                              
Weighted Average Exercise Price                                          
Outstanding at the beginning of the period (in dollars per share)           $ 4.98                              
Granted (in dollars per share)           $ 16.32                   $ 16.32          
Exercised (in dollars per share)           $ 2.69                              
Cancelled or expired (in dollars per share)           $ 9.09                              
Outstanding at the end of the period (in dollars per share)         $ 5.59 $ 5.59                              
Options exercisable at the end of the period (in dollars per share)         $ 5.18 $ 5.18                              
Vested and expected to vest at the end of the period (in dollars per share)         $ 5.59 $ 5.59                              
Aggregate Intrinsic Value                                          
Outstanding at the end of the period         $ 7,870,369 $ 7,870,369                              
Options exercisable at the end of the period         7,434,216 7,434,216                              
Vested and expected to vest at the end of the period         7,870,369 7,870,369                              
Assumptions used to determine the intrinsic fair market value of options using Black Scholes option pricing model                                          
Expected volatility (as a percent)         56.00%                                
Risk free interest rate (as a percent)         0.39%                                
Expected term         5 years                                
Weighted average grant date fair value of options granted (in dollars per share)           $ 7.72                              
The total intrinsic value of all options exercised           1,843,794 1,823,092                            
Restricted Stock Units                                          
Outstanding at the beginning of the period (in shares)                   176,209                      
Awarded (in shares)                   13,553                      
Awards                                 300,000        
Shares vested (in shares)                   (80,896)                      
Outstanding at the end of the period (in shares)               108,866   108,866                      
Weighted Average Award Date Fair Value                                          
Outstanding at the beginning of the period (in dollars per share)                   $ 6.98                      
Awarded (in dollars per share)                   $ 15.62                      
Shares vested (in dollars per share)                   $ 5.96                      
Outstanding at the end of the period (in dollars per share)               $ 8.77   $ 8.77                      
Additional share-based compensation disclosures                                          
Total amount of consideration received from the exercised options           320,012 162,182                            
Compensation expense $ 310,153 $ 382,022 $ 497,054 $ 631,357       $ 95,716 $ 131,346 $ 189,431 $ 254,150 $ 79,437 $ 84,467 $ 97,623 $ 104,747     $ 75,000 $ 106,251 $ 150,000 $ 212,502
Shares surrendered in lieu of payment of withholding taxes (in shares)     39,707 35,930                                  
Average market price of shares surrendered in lieu of payment of withholding taxes (in dollars per share)     $ 16.93 $ 17.78