Capital Structure	9 Months Ended
Sep. 30, 2015
Text Block [Abstract]
Capital Structure	9. Capital Structure The Company has one class of common stock outstanding. During the three months ended September 30, 2015 and 2014, the Company did not acquire any shares of common stock from employees in connection with withholding tax payments related to the vesting of restricted stock. During the nine months ended September 30, 2015 and 2014, the Company acquired 13,573 and 18,256 shares of common stock, respectively, from employees in connection with withholding tax payments related to the vesting of restricted stock for a total consideration of $421 and $459. The weighted average purchase price of $30.99 and $25.14, respectively, was the average of the high and low price of the Company’s shares of common stock on the Nasdaq Global Select Market on the trading day prior to the vesting date of the shares of restricted stock. On December 30, 2014, the Company’s Board of Directors authorized a common stock repurchase program of up to $20,000 annually (the “2014 Repurchase Program”), under which shares may be purchased by the Company from time to time from the open market and through private transactions during each of the fiscal years 2015 to 2017. During the three months and nine months ended September 30, 2015, the Company purchased 220,579 and 354,448 shares of its common stock for an aggregate purchase price of approximately $8,149 and $12,834 including commissions, representing an average purchase price per share of $36.94 and $36.21, respectively under the 2014 Repurchase Program. Repurchased shares have been recorded as treasury shares and will be held until the Company’s board of directors designates that these shares be retired or used for other purposes.

9. Capital Structure

The Company has one class of common stock outstanding.

During the three months ended September 30, 2015 and 2014, the Company did not acquire any shares of common stock from employees in connection with withholding tax payments related to the vesting of restricted stock.

During the nine months ended September 30, 2015 and 2014, the Company acquired 13,573 and 18,256 shares of common stock, respectively, from employees in connection with withholding tax payments related to the vesting of restricted stock for a total consideration of $421 and $459. The weighted average purchase price of $30.99 and $25.14, respectively, was the average of the high and low price of the Company’s shares of common stock on the Nasdaq Global Select Market on the trading day prior to the vesting date of the shares of restricted stock.

On December 30, 2014, the Company’s Board of Directors authorized a common stock repurchase program of up to $20,000 annually (the “2014 Repurchase Program”), under which shares may be purchased by the Company from time to time from the open market and through private transactions during each of the fiscal years 2015 to 2017. During the three months and nine months ended September 30, 2015, the Company purchased 220,579 and 354,448 shares of its common stock for an aggregate purchase price of approximately $8,149 and $12,834 including commissions, representing an average purchase price per share of $36.94 and $36.21, respectively under the 2014 Repurchase Program.

Repurchased shares have been recorded as treasury shares and will be held until the Company’s board of directors designates that these shares be retired or used for other purposes.