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Stockholders' Equity | 6 Months Ended
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Jun. 30, 2025
Stockholders' Equity Note [Abstract] |
Stockholders' Equity | 10. Stockholders’ Equity ​ Earnings Per Share ​ Basic earnings per share (“EPS”) is computed by dividing net income by the weighted average number of shares of common stock outstanding during the year. Diluted EPS is computed considering the dilutive effect of stock options, restricted stock, restricted stock units and performance stock units. The vesting of unvested, contingently issuable performance stock units is based on the achievement of certain earnings per share targets and total shareholder return. These shares are considered contingently issuable shares for purposes of calculating diluted earnings per share. These shares are not included in the diluted earnings per share denominator until the performance criteria are met, if it is assumed that the end of the reporting period was the end of the contingency period. ​ Unvested restricted stock, restricted stock units and performance stock units are included in diluted earnings per share, weighted outstanding until the shares and units vest. Upon vesting, the vested restricted stock, restricted stock units and performance stock units are included in basic earnings per share weighted outstanding from the vesting date. ​ There were zero anti-dilutive stock options excluded from the calculation of diluted EPS for the three and six months ended June 30, 2025 and 2024. ​ The following table reconciles the number of shares outstanding with the number of shares used in computing basic and diluted earnings per share for each of the periods presented (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024 |
Common shares outstanding, end of period | ​ | 35,281 |  | 35,691 | ​ | 35,281 |  | 35,691 | ​
Effect of using weighted average common shares outstanding | ​ | 26 |  | 55 | ​ | 134 |  | 51 | ​
Shares used in computing earnings per share—basic | ​ | 35,307 |  | 35,746 | ​ | 35,415 |  | 35,742 | ​
Effect of shares issuable under stock option plans based on the treasury stock method | ​ | 21 |  | 30 | ​ | 24 |  | 30 | ​
Effect of restricted and contingently issuable shares | ​ | 41 |  | 52 | ​ | 47 |  | 56 | ​
Shares used in computing earnings per share—diluted | ​ | 35,369 |  | 35,828 | ​ | 35,486 |  | 35,828 | ​
​ Share Repurchase Program ​ On March 29, 2007, our Board of Directors (the “Board”) approved a stock repurchase program to acquire up to 1.0 million shares of our outstanding common stock. Subsequently, the Board has from time to time increased the number of shares that may be acquired under the program and approved extensions of the program. On May 16, 2025, the Board approved an extension to the program by increasing the shares authorized for repurchase by 0.4 million shares. Since the inception of the repurchase program, the Board has approved 11.8 million shares to be repurchased. As of June 30, 2025, we have repurchased a cumulative total of 10.8 million shares at an average price of $40.89 per share under the repurchase program. ​ The share repurchases will be made from time to time at our discretion in the open market or privately negotiated transactions, including pursuant to Rule 10b5-1 share repurchase plans, as permitted by securities laws and other legal requirements, and subject to market conditions and other factors. The Board may modify, suspend, extend or terminate the program at any time. During the six months ended June 30, 2025, we repurchased 0.3 million shares for approximately $112.2 million, inclusive of the applicable excise tax, at an average price of $343.79 per share.

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