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Share-Based Compensation
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Share-Based Compensation Share-Based Compensation
We have certain share-based compensation plans. Under the fair value method, compensation cost is measured at the grant date based on the fair value of the award and is recognized over the service period which generally corresponds to the vesting period. Awards under our plans generally vest over periods ranging from one to three years.

Table 13.1 shows the number of restricted stock units (RSUs) granted to employees and the weighted average fair value per share during the periods presented (shares in thousands).
Restricted stock unit grants
Table
13.1
Nine months ended September 30,
20212020
RSUs
Granted
(in thousands)
Weighted Average Share Fair Value
RSUs
Granted
(in thousands)
Weighted Average Share Fair Value
RSUs subject to performance conditions966 $12.82 1,282 $12.87 
RSUs subject only to service conditions398 12.82 390 12.91