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Share-Based Compensation (Details 2) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Employee And Nonemployee Stock Option [Member]
Jun. 30, 2013
Employee And Nonemployee Stock Option [Member]
Jun. 30, 2014
Employee And Nonemployee Stock Option [Member]
Jun. 30, 2013
Employee And Nonemployee Stock Option [Member]
Jun. 30, 2014
Employee And Nonemployee Stock Option [Member]
Maximum [Member]
Jun. 30, 2014
Employee And Nonemployee Stock Option [Member]
Minimum [Member]
Jun. 30, 2014
Restricted Stock Units R S U [Member]
Jun. 30, 2013
Restricted Stock Units R S U [Member]
Jun. 30, 2014
Restricted Stock Units R S U [Member]
Jun. 30, 2013
Restricted Stock Units R S U [Member]
Jun. 11, 2014
Director Stock Option [Member]
Mar. 12, 2014
Director Stock Option [Member]
Jun. 11, 2014
Employee Stock Option [Member]
Feb. 18, 2014
Incentive Plan2003 [Member]
Chief Executive Officer [Member]
Common Stock [Member]
Jun. 30, 2014
Incentive Plan2003 [Member]
Chief Executive Officer [Member]
Common Stock [Member]
Jun. 30, 2013
Incentive Plan2003 [Member]
Chief Executive Officer [Member]
Common Stock [Member]
Jun. 30, 2014
Incentive Plan2003 [Member]
Chief Executive Officer [Member]
Common Stock [Member]
Jun. 30, 2013
Incentive Plan2003 [Member]
Chief Executive Officer [Member]
Common Stock [Member]
Shares Under Options                                            
Outstanding at the beginning of the period (in shares)             467,500                              
Granted (in shares)             30,193               14,616 577 15,000          
Exercised (in shares)             (159,336)                              
Outstanding at the end of the period (in shares)         338,357   338,357                              
Exercisable at the end of the period (in shares)         249,608   249,608                              
Vested and expected to vest at the end of the period (in shares)         338,357   338,357                              
Weighted Average Exercise Price                                            
Outstanding at the beginning of the period (in dollars per share)             $ 9.00                              
Granted (in dollars per share)             $ 25.05               $ 0.00 $ 25.48 $ 25.04          
Exercised (in dollars per share)             $ 4.23                              
Outstanding at the end of the period (in dollars per share)         $ 12.67   $ 12.67                              
Exercisable at the end of the period (in dollars per share)         $ 9.95   $ 9.95                              
Vested and expected to vest at the end of the period (in dollars per share)         $ 12.67   $ 12.67                              
Weighted Average Remaining Contractual Life                                            
Outstanding at the end of the period             4 years 3 months 22 days                              
Exercisable at the end of the period             4 years 5 months 12 days                              
Vested and expected to vest at the end of the period             4 years 3 months 22 days                              
Aggregate Intrinsic Value                                            
Outstanding at the end of the period         $ 3,892,000   $ 3,892,000                              
Exercisable at the end of the period         3,545,000   3,545,000                              
Vested and expected to vest at the end of the period         3,892,000   3,892,000                              
Assumptions used to determine the intrinsic fair market value of options using Black Scholes option pricing model                                            
Expected volatility (as a percent)                 37.90% 32.80%                        
Expected dividends (as a percent)             0.00%                              
Risk free interest rate (as a percent)                 0.80% 0.70%                        
Expected term                 5 years 3 years 9 months 18 days                        
Weighted average grant date fair value of options granted (in dollars per share)             $ 7.47                              
The total intrinsic value of all options exercised             3,400,000 155,000                            
Restricted Stock Units                                            
Unvested at the beginning of the period (in shares)                         50,900                  
Awards                                   400,000     200,000  
Awarded (in shares)                         22,338                  
Shares vested (in shares)                         (30,253)                  
Unvested at the end of the period (in shares)                     42,985   42,985                  
Weighted Average Award Date Fair Value                                            
Unvested at the beginning of the period (in dollars per share)                         $ 11.94                  
Awarded (in dollars per share)                         $ 25.94                  
Shares vested (in dollars per share)                         $ 10.11                  
Unvested at the end of the period (in dollars per share)                     $ 17.70   $ 17.70                  
Additional share-based compensation disclosures                                            
Total amount of consideration received from the exercised options             675,000 65,000                            
Compensation expense 465,000 328,000 730,000 507,000 172,000 100,000 267,000 125,000     70,000 68,000 136,000 122,000         100,000 100,000 200,000 200,000
Net-share settlement (in shares)             17,233           9,878 22,089                
Net-share settlement, market price per share                         $ 25.88 $ 19.29                
Unrecognized compensation expense $ 1,000,000   $ 1,000,000               $ 1.0   $ 1.0                  
Weighted average period of recognition of unrecognized compensation expense                         4 years                  
Shares surrendered in lieu of payment of exercise price and withholding taxes             31,310                              
Shares surrendered in lieu of payment of exercise price of awards             14,077                              
Average market price of shares surrendered in lieu of payment of exercise price and withholding taxes (in dollars per share)             $ 25.47