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Share-Based Compensation | 9 Months Ended
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Sep. 30, 2019
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,
|  | 2019 |  | 2018
|  | RSUs Granted | Weighted Average Share Fair Value |  | RSUs Granted | Weighted Average Share Fair Value
RSUs subject to performance conditions | 1,378 |  | $ | 11.76 |  |  | 1,239 |  | $ | 15.80 |
RSUs subject only to service conditions | 605 |  | 12.21 |  |  | 447 |  | 15.39 |

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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