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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Share-based Compensation Related to Restricted Stock Awards | The total stock-based compensation expense related to restricted stock awards for the years ended December 31, are as follows (in thousands):
| 2020 |  | 2019 |  | 2018
Employees | $ | 2,223 |  |  | $ | 2,667 |  |  | $ | 2,332 |
Non-employee Directors | 635 |  |  | 597 |  |  | 553 |
Total | $ | 2,858 |  |  | $ | 3,264 |  |  | $ | 2,885 |
Stock-based Compensation Expense | Stock-based compensation consisting of restricted stock awards was included in costs and operating expenses and provision for income taxes on the accompanying statements of income for the years ended December 31, 2020, 2019 and 2018 (in thousands):
| 2020 |  | 2019 |  | 2018
Stock-based compensation included in costs and operating expenses | $ | 2,858 |  |  | $ | 3,264 |  |  | $ | 3,027 |
Income tax benefit recognized for stock-based compensation | (713) |  |  | (663) |  |  | (755) |
Stock-based compensation expense, net of income tax benefit | $ | 2,145 |  |  | $ | 2,601 |  |  | $ | 2,272 |
Schedule of Other Restricted Stock Awards |
|  | Number of Shares |  | Weighted Average Grant Date Fair Value
Unvested as of December 31, 2018 |  | — |  | $ | — |
Granted |  | 86,911 |  | 31.92 |
Vested |  | (29,110) |  | 30.66 |
Forfeited |  | — |  | — |
Unvested as of December 31, 2019 |  | 57,801 |  | 32.56 |
Granted |  | 30,500 |  | 31.50 |
Vested |  | (32,017) |  | 32.14 |
Forfeited |  | — |  | — |
Unvested as of December 31, 2020 |  | 56,284 |  | $ | 32.23 |

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