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Stock-Based Compensation - Stock Option Awards, Textuals (Details) - USD ($) | 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] |  |  |
Proceeds from exercise of stock options | $ 122,000 | $ 58,000 | $ 133,000
Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | 0 | 0 | 0
Tax benefit | 0 | 0 | 0
Intrinsic value of options exercised | 61,000 | 60,000 | 202,000
Proceeds from exercise of stock options | $ 122,000 | $ 58,000 | $ 132,000
PRSU |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 4 years |  |
Option 1 | Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 5 years |  |
Option 2 | Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 4 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years |  |

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