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Employee Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Employee Stock-Based Compensation | 9. Employee Stock-Based Compensation Time Based Restricted Stock Unit Grants In the first nine months of 2023, our board of directors granted 479,000 restricted stock units (“RSUs”) to employees under our 2014 Incentive Plan for which vesting is based solely on continuous employment over the requisite service period. These grants vest over a service period between one and four years. The weighted average grant date fair value for these RSUs was $85.30 per unit, which was based on the closing stock price on the respective grant dates. Performance, Market and Service Condition Based Restricted Stock Unit Grants In the first nine months of 2023, our board of directors granted 161,000 RSUs to employees under our 2014 Incentive Plan, which cliff vest on the third anniversary of the grant date based on the Company’s level of achievement of performance goals relating to return on invested capital over a three-year period (“performance condition”) and continued employment during the performance period (“service condition”). The total number of shares of common stock that may be earned from the performance condition ranges from zero to 200% of the RSUs granted. The number of shares earned from the performance condition may be further increased by 10% or decreased by 10% based on the Company’s total shareholder return relative to a peer group during the performance period (“market condition”). The average grant date fair value for these RSUs, with consideration of the market condition, wa s $83.75 per unit, which was determined using the Monte Carlo simulation model, applying the following assumptions:
Expected volatility (company) | 46.5%
Expected volatility (peer group median) | 32.1%
Correlation between the Company and peer group median | 0.5
Expected dividend yield | 0.0%
Risk-free rate | 3.8%
The expected volatilities and correlation are based on the historical daily returns of our common stock and the common stocks of the constituents of our peer group over the most recent period equal to the measurement period. The expected dividend yield is based on our history of not paying regular dividends in the past and our current intention to not pay regular dividends in the foreseeable future. The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant and has a term equal to the measurement period.

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