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Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2021
Stock-based Compensation |
Schedule of status of and changes in the Company's stock option awards | A summary of the status of, and changes in, the Company's stock option awards for the three months ended March 31, 2021, follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted-
​ | ​ | ​ |  |  | Weighted- | ​ | Average
​ | ​ | ​ | ​ | ​ | Average | ​ | Remaining
​ | ​ | ​ | ​ | ​ | Exercise | ​ | Contractual
​ |  | Shares |  | Price |  | Life
Outstanding at beginning of period | ​ |  | 39,085 |  | $ | 23.53 | ​ | ​ | 5.88
Exercised | ​ |  | — | ​ |  | — | ​ | ​ | ​
Forfeited | ​ |  | — | ​ | ​ | — | ​ | ​ | ​
Expired | ​ |  | (5,279) | ​ |  | 23.53 | ​ | ​ | ​
Outstanding at end of period | ​ |  | 33,806 |  | $ | 23.53 |  | ​ | 5.63
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercisable at end of period | ​ |  | 33,806 |  | $ | 23.53 |  | ​ | 5.63
Summary of the changes in company deferred stock units | A summary of changes in the Company’s restricted stock unit and deferred stock unit awards for the three months ended March 31, 2021, is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Weighted- | ​ | Director | ​ | Weighted-
​ | ​ | Restricted | ​ | Average | ​ | Deferred | ​ | Average
​ | ​ | Stock | ​ | Grant Date | ​ | Stock | ​ | Grant Date
​ |  | Units |  | Fair Value |  | Units |  | Fair Value
Non-vested at beginning of period |  | ​ | 1,017,038 |  | $ | 23.87 |  | ​ | 34,263 |  | $ | 17.18
Granted |  | ​ | 212,426 | ​ |  | 24.54 |  | ​ | 33,288 | ​ |  | 24.54
Dividend equivalents earned |  | ​ | 11,310 | ​ |  | 20.67 |  | ​ | 1,172 | ​ |  | 20.67
Vested |  | ​ | — | ​ |  | — |  | ​ | (791) | ​ |  | 20.67
Forfeited |  | ​ | (13,422) | ​ |  | 26.98 |  | ​ | — | ​ |  | —
Non-vested at end of period |  | ​ | 1,227,352 |  | $ | 23.93 |  | ​ | 67,932 |  | $ | 20.81
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at end of period |  | ​ | 1,227,352 |  | $ | 23.93 |  | ​ | 71,835 |  | $ | 24.30

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