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Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2021
Stock-based Compensation |
Summary of 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 six months ended June 30, 2021, follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted-
​ | ​ | ​ |  |  | Weighted- | ​ | Average
​ | ​ | ​ | ​ | ​ | Average | ​ | Remaining
​ | ​ | ​ | ​ | ​ | Exercise | ​ | Contractual
​ |  | Shares |  | Price |  | Life
Outstanding at beginning of period | ​ |  | 39,085 |  | $ | 23.53 | ​ | ​ | 5.88
Expired | ​ |  | (6,379) | ​ |  | 23.53 | ​ | ​ | ​
Outstanding at end of period | ​ |  | 32,706 |  | $ | 23.53 |  | ​ | 5.38
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercisable at end of period | ​ |  | 32,706 |  | $ | 23.53 |  | ​ | 5.38
Summary of changes in the Company's RSU, PSU, and DSU awards | A summary of changes in the Company’s RSU, PSU, and DSU awards for the six months ended June 30, 2021, is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | RSU Awards | ​ | PSU Awards | ​ | DSU Awards
​ | ​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​ | ​ | Weighted-
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date | ​ | ​ | ​ | Grant Date | ​ | ​ | ​ | Grant Date
​ |  | Shares |  | Fair Value |  | Shares (1) |  | Fair Value |  | Shares |  | Fair Value
Nonvested at beginning of period |  | ​ | 1,017,038 |  | $ | 23.87 |  | ​ | 15,724 |  | $ | 16.25 |  | ​ | 34,263 |  | $ | 17.18
Granted |  | ​ | 212,426 | ​ |  | 24.54 |  | ​ | 99,159 | ​ |  | 23.91 |  | ​ | 35,664 | ​ |  | 24.59
Dividend equivalents earned |  | ​ | 22,573 | ​ |  | 22.82 |  | ​ | — | ​ |  | — |  | ​ | 2,459 | ​ |  | 22.93
Vested |  | ​ | — | ​ |  | — |  | ​ | — | ​ |  | — |  | ​ | (1,452) | ​ |  | 22.63
Forfeited |  | ​ | (19,907) | ​ |  | 25.04 |  | ​ | (459) | ​ |  | 23.48 |  | ​ | — | ​ |  | —
Nonvested at end of period |  | ​ | 1,232,130 |  | $ | 23.95 |  | ​ | 114,424 |  | $ | 22.86 |  | ​ | 70,934 |  | $ | 20.99
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Vested and outstanding at end of period |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | 72,496 |  | $ | 24.30
Schedule of Stock-based compensation expense | Stock-based compensation expense related to nonvested restricted stock units, deferred stock units, and performance-based restricted stock awards is presented in the table below (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Stock-based compensation expense | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
RSU awards | ​ | $ | 1,816 | ​ | $ | 924 | ​ | $ | 3,046 | ​ | $ | 2,069
PSU awards | ​ | ​ | 268 | ​ | ​ | — | ​ | ​ | 328 | ​ | ​ | —
DSU awards | ​ | ​ | 353 | ​ | ​ | 145 | ​ | ​ | 511 | ​ | ​ | 139
Total stock-based compensation expense | ​ | $ | 2,437 | ​ | $ | 1,069 | ​ | $ | 3,885 | ​ | $ | 2,208
Schedule of Unamortized stock-based compensation expense | Unamortized stock-based compensation expense related to nonvested restricted stock units, deferred stock units, and performance-based restricted stock awards is presented in the table below (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of | ​
​ | ​ | June 30, | ​ | December 31, | ​
​ |  | 2021 |  | 2020 |
Unamortized stock-based compensation expense | ​ | ​ | ​ | ​ | ​ | ​ | ​
RSU awards | ​ | $ | 12,094 | ​ | $ | 10,411 | ​
PSU awards | ​ | ​ | 1,690 | ​ | ​ | 179 | ​
DSU awards | ​ | ​ | 660 | ​ | ​ | 294 | ​
Total unamortized stock-based compensation expense | ​ | $ | 14,444 | ​ | $ | 10,884 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average period over which expense is to be recognized | ​ | ​ | 3.2 | yrs | ​ | 3.0 | yrs
Schedule of shares remaining available for issuance pursuant to authorized plans | ​
​ | ​ | ​ | ​
​ | ​ | Shares Remaining
​ | ​ | Available for Issuance
​ |  | Pursuant to the Plans
2020 Equity Plan | ​ | ​ | 1,087,266
2021 Employee Stock Purchase Plan | ​ | ​ | 600,000

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