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Stock-based compensation (Tables) | 3 Months Ended
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Mar. 31, 2021
Executive Officers |
Schedule of Unvested Restricted Stock Units Roll Forward | The following table summarizes the restricted stock and performance shares activity under the Incentive Plan for members of management.
(Not in thousands) | Shares |  | Weighted-Average Grant Date Fair Value
Non-vested at December 31, 2019 | 345,365 | $ | 41.68
Granted | 253,943 |  | 42.49
Performance Shares Quantity Adjustment | (7) |  | 48.79
Vested | (234,421) |  | 42.64
Forfeited | (6,368) |  | 44.26
Non-vested at December 31, 2020 | 358,512 | $ | 41.23
Granted | 124,613 |  | 66.84
Performance Shares Quantity Adjustment | 46,704 |  | 51.48
Vested | (193,946) |  | 57.16
Non-vested at March 31, 2021 | 335,883 | $ | 42.96
Directors |
Schedule of Unvested Restricted Stock Units Roll Forward | The following table summarizes the restricted stock activity under the Incentive Plan for members of the Board of Directors:
(Not in thousands) |  | Restricted Stock units |  | Weighted-Average Grant Date Fair Value per Unit
Non-vested at December 31, 2019 | $ | - | $ | -
Granted |  | 43,866 |  | 35.47
Vested |  | (43,866) |  | 35.47
Forfeited |  | - |  | -
Non-vested at December 31, 2020 | $ | - | $ | -
Granted |  | 524 |  | 55.23
Vested |  | (524) |  | 55.23
Forfeited |  | - |  | -
Non-vested at March 31, 2021 | $ | - | $ | -

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- Definition Tabular disclosure of the change in restricted stock units (RSUs). + References No definition available. + Details
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