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Stock-based Compensation | 3 Months Ended
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Mar. 31, 2020
Share-based Payment Arrangement [Abstract] |
Stock-based Compensation | 7. STOCK-BASED COMPENSATION Stock Unit Awards Restricted stock unit ("RSU") and performance stock unit ("PSU") awards activity is presented in the following tables.
| RSU Shares (in 000's) | PSU Shares (in 000's) |  | Total Shares (in 000's) |  | Weighted Average Grant Date Fair Value | Weighted Average Remaining Contractual Life (in years)
Unvested as of December 31, 2019 | 1,532.3 |  | 286.8 |  |  | 1,819.1 |  |  | $ | 141.51 |  | 2.39
Granted | 9.7 |  | — |  |  | 9.7 |  |  | 160.03 |  |
Vested | (324.6 | ) | — |  |  | (324.6 | ) |  | 136.91 |  |
Forfeited | (8.5 | ) | — |  |  | (8.5 | ) |  | 137.68 |  |
Unvested as of March 31, 2020 | 1,208.9 |  | 286.8 |  |  | 1,495.7 |  |  | $ | 144.71 |  | 1.78
Unvested as of December 31, 2018 | 559.6 |  | 93.1 |  |  | 652.7 |  |  | $ | 131.32 |  | 2.02
Granted | 74.7 |  | — |  |  | 74.7 |  |  | 152.84 |  |
Vested | (195.5 | ) | — |  |  | (195.5 | ) |  | 114.79 |  |
Forfeited | (4.5 | ) | (0.4 | ) |  | (4.9 | ) |  | 126.70 |  |
Unvested as of March 31, 2019 | 434.3 |  | 92.7 |  |  | 527.0 |  |  | $ | 140.55 |  | 2.15
During the three months ended March 31, 2020, we recognized a $5.5 million expense reversal to reflect our revised estimate of PSU achievement in response to the anticipated impact of the COVID-19 pandemic. As of March 31, 2020, we had $107.2 million of unamortized deferred compensation related to unvested RSUs and PSUs, which we anticipate recognizing over varying periods into 2024; $66.9 million relates to the awards issued in conjunction with the HFF acquisition.

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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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- References No definition available. + Details
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