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Shareholders’ Equity and Stock Incentive Plans (Tables) | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
Summary of Stock Option Activity | The following table summarizes the Company’s stock option activity:
| Stock Options
| Shares |  | Weighted-Average Exercise Price
Outstanding at January 1, 2021 | 2,891,341 |  |  | $ | 11.07 |
Granted | — |  |  | $ | — |
Exercised | (34,334) |  |  | $ | 14.90 |
Cancelled | — |  |  | $ | — |
Expired | — |  |  | $ | — |
Outstanding at March 31, 2021 | 2,857,007 |  |  | $ | 11.03 |
Exercisable at March 31, 2021 | 2,857,007 |  |  | $ | 11.03 |
Summary of Activity Related To Time-based Restricted Stock Units (RSUs) and Performance-based Restricted Stock Units (PSUs) | The following table summarizes the Company’s activity related to time-based restricted stock units (“RSUs”) and performance-based restricted stock units (“PSUs”):
|  | RSUs |  | PSUs
|  | Shares |  | Weighted-Average Grant Date Fair Value |  | Shares (1) |  | Weighted-Average Grant Date Fair Value
Outstanding at January 1, 2021 |  | 943,957 |  |  | $ | 12.06 |  |  | 743,719 |  |  | $ | 13.82 |
Granted |  | 211,073 |  |  | $ | 29.00 |  |  | 119,073 |  |  | $ | 29.00 |
Vested |  | (313,652) |  |  | $ | 13.72 |  |  | (89,920) |  |  | $ | 25.73 |
Cancelled |  | (2,606) |  |  | $ | 11.77 |  |  | (77,725) |  |  | $ | 25.23 |
Outstanding at March 31, 2021 |  | 838,772 |  |  | $ | 15.71 |  |  | 695,147 |  |  | $ | 13.61 |
(1) 62,791 of the 77,725 PSUs cancelled during the three months ended March 31, 2021 related to PSUs granted in November 2017, for which applicable performance goals were not met. 14,934 of the 77,725 PSUs cancelled during the period related to PSUs granted in March 2019 (the “2019 PSU Awards”). The Company’s financial results for the applicable performance goals were certified during the three months ended March 31, 2021, which resulted in the reduction of the shares subject to the 2019 PSU Awards from 204,580 to 189,646. In addition, 18,452 of the shares under the 2019 PSU Awards vested during the three months ended March 31, 2021. 71,468 of the PSUs included in the outstanding balance at January 1, 2021 represented PSUs granted in March 2018 (the “2018 PSU Awards”). The Company’s financial results for the applicable performance goals were certified during the three months ended March 31, 2020, which resulted in the reduction of the shares subject to the 2018 PSU Awards during the three months ended March 31, 2020, and all of the 71,468 remaining shares under the 2018 PSU Awards vested during the three months ended March 31, 2021. The number of outstanding PSUs for the remainder of the PSUs included in the outstanding balance at March 31, 2021 represents the “target” number of PSUs granted to each recipient eligible to vest if the Company meets its “target” performance goals for the applicable period. The actual number of PSUs eligible to vest for those PSUs will vary depending on whether or not the Company meets or exceeds the applicable threshold, target, or maximum performance goals for the PSUs, with 200% of the “target” number of PSUs eligible to vest at “maximum” performance levels.

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