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Stock-Based Compensation - Restricted Stock Awards, Textuals (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock awards issued, net of forfeitures | $ 442 | $ 1,300 | $ 2,200
Restricted Stock Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | 76 | 440 | 907
Tax benefit | $ 17 | $ 93 | $ 191
PRSU |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 4 years |  |

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