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Share-Based Compensation (Details 2) (USD $)
6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Stock option
Jun. 30, 2012
Stock option
Jun. 30, 2013
Stock option
Maximum
Jun. 30, 2013
Stock option
Minimum
Mar. 31, 2013
Common Stock
Jun. 30, 2013
RSUs
Jun. 30, 2012
RSUs
Jun. 30, 2013
RSUs
Jun. 30, 2012
RSUs
Jun. 30, 2013
Directors and employees
Stock option
Jun. 30, 2012
Directors and employees
Stock option
Jun. 30, 2013
Directors and employees
Stock option
Jun. 30, 2012
Directors and employees
Stock option
Jun. 12, 2013
Director
Stock option
Feb. 18, 2013
2003 Incentive Plan
Chairman, Chief Executive Officer, and President
Common Stock
Jun. 30, 2013
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, 2013
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
Dec. 31, 2012
2003 Incentive Plan
Chairman, Chief Executive Officer, and President
Common Stock
Shares Under Options                                            
Outstanding at the beginning of the period (in shares)     493,888       60,000                              
Granted (in shares)     67,362                         7,362            
Exercised (in shares)     (11,250)                                      
Outstanding at the end of the period (in shares)     550,000       60,000                              
Options exercisable at the end of the period (in shares)     473,750                                      
Vested and expected to vest at the end of the period (in shares)     550,000                                      
Weighted Average Exercise Price                                            
Outstanding at the beginning of the period (in dollars per share)     $ 5.47       $ 18.85                              
Granted (in dollars per share)     $ 18.88                         $ 19.08            
Exercised (in dollars per share)     $ 5.78                                      
Outstanding at the end of the period (in dollars per share)     $ 7.11       $ 18.85                              
Options exercisable at the end of the period (in dollars per share)     $ 5.46                                      
Vested and expected to vest at the end of the period (in dollars per share)     $ 7.11                                      
Aggregate Intrinsic Value                                            
Outstanding at the end of the period     $ 7,774,290                                      
Options exercisable at the end of the period     7,473,940                                      
Vested and expected to vest at the end of the period     7,774,290                                      
Assumptions used to determine the intrinsic fair market value of options using Black Scholes option pricing model                                            
Expected volatility (as a percent)         50.00% 40.00%                                
Expected dividends (as a percent)     0.00%                                      
Risk free interest rate (as a percent)     0.40%                                      
Expected term         5 years 3 years 9 months 18 days                                
Weighted average grant date fair value of options granted (in dollars per share)     $ 6.03                                      
The total intrinsic value of all options exercised     154,564 1,843,794                                    
Restricted Stock Units                                            
Unvested at the beginning of the period (in shares)                   108,866                        
Awards                                 400,000         300,000
Awarded (in shares)                   10,600                        
Shares vested (in shares)                   (61,635)                        
Forfeited / cancelled (in shares)                   (5,679)                        
Unvested at the end of the period (in shares)               52,152   52,152                        
Weighted Average Award Date Fair Value                                            
Unvested at the beginning of the period (in dollars per share)                   $ 8.77                        
Awarded (in dollars per share)                   $ 19.97                        
Shares vested (in dollars per share)                   $ 6.67                        
Forfeited / cancelled (in dollars per share)                   $ 11.74                        
Unvested at the end of the period (in dollars per share)               $ 13.20   $ 13.20                        
Additional share-based compensation disclosures                                            
Total amount of consideration received from the exercised options     65,063 320,012                                    
Compensation expense               68,336 95,716 122,280 189,431 99,810 79,437 125,206 97,623     100,000 75,000 200,000 150,000  
Shares surrendered in lieu of payment of withholding taxes (in shares) 22,089 39,707                                        
Average market price of shares surrendered in lieu of payment of withholding taxes (in dollars per share) $ 19.29 $ 16.93                                        
Unrecognized compensation expense $ 1,070,543                                          
Weighted average period of recognition of unrecognized compensation expense 1 year 2 months 26 days