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Stock-Based Compensation (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |  |
Summary of Activity for Restricted Stock Awards | The following table provides a summary of activity with regard to restricted stock awards in the three months ended March 31, 2021:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested at beginning of year |  |  | 6,228,048 |  |  | $ | 12.43 |
Granted |  |  | 3,029,949 |  |  |  | 11.15 |
Vested |  |  | (1,918,654 | ) |  |  | 13.21 |
Canceled |  |  | (59,260 | ) |  |  | 11.65 |
Unvested at end of period |  |  | 7,280,083 |  |  |  | 11.70 |
| The following table provides a summary of activity with regard to restricted stock awards in the year ended December 31, 2020:
|  | For the Year Ended December 31, 2020 |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested at beginning of year |  |  | 6,516,101 |  |  | $ | 13.31 |
Granted |  |  | 2,421,345 |  |  |  | 11.61 |
Vested |  |  | (2,180,891 | ) |  |  | 14.06 |
Canceled |  |  | (528,507 | ) |  |  | 12.88 |
Unvested at end of year |  |  | 6,228,048 |  |  |  | 12.43 |
Summary of Activity for Performance-Based Restricted Stock Units | The following table provides a summary of activity with regard to Performance-Based Restricted Stock Units (“PSUs”) in the three months ended March 31, 2021:
|  | Number of Shares |  |  | Performance Period |  |  | Expected Vesting Date |
Outstanding at beginning of year |  |  | 477,872 |  |  |  |  |  |  |  |  |
Granted |  |  | 307,479 |  |  |  | January 1, 2021 - December 31, 2023 |  |  |  | March 31, 2024 |
Outstanding at end of period |  |  | 785,351 |  |  |  |  |  |  |  |  |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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