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7. SHARE-BASED COMPENSATION (Policies) | 6 Months Ended
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Jun. 30, 2022
Share-Based Payment Arrangement [Abstract] |
Share-Based Compensation | Share-Based Compensation We issue share-based compensation to employees in the form of stock options, restricted stock units (RSUs), and performance stock units (PSUs). We account for the share-based awards by recognizing the fair value of share-based compensation expense on a straight-line basis over the service period of the award, net of estimated forfeitures. The fair value of stock options is estimated on the grant date using the Black-Scholes option pricing model. The fair value of RSUs and non-executive PSUs is based on the closing price of our common stock on the grant date. Executive PSUs are valued using a Monte Carlo simulation model using the following inputs: stock price, volatility, and risk-free interest rates. Changes in estimated inputs or using other option valuation methods may result in materially different option values and share-based compensation expense.

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