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Stock Incentive Plans (Tables) | 9 Months Ended
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Sep. 30, 2019
Share-based Payment Arrangement [Abstract] |
Summary of Restricted Stock Activity | The following table presents the restricted stock activity for the nine months ended September 30, 2019 (in thousands, except per share amounts):
| Number of Restricted Stock |  | Weighted-Average Grant Date Fair Value |  | Total Intrinsic Value of Restricted Stock Vested
Outstanding at December 31, 2018 (1) | 1,320 |  |  | $ | 24.94 |  |  |
Granted | 69 |  |  | $ | 33.08 |  |  |
Forfeited | (51) |  |  | $ | 24.23 |  |  |
Vested (2) | (129) |  |  | $ | 23.75 |  |  | $ | 4,602 |
Outstanding at September 30, 2019 | 1,209 |  |  | $ | 25.55 |  |  |
(1) The weighted-average grant date fair value at December 31, 2018 has been updated to correct an immaterial reporting error in our 2018 Annual Report on Form 10-K. (2) The increase in shares vested during the nine months ended September 30, 2019 was due to the acceleration of stock-based compensation expense triggered by a change in control of KGS.

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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