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Stock Based Compensation - Allocation of Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Compensation expense |  |  |
Stock-based compensation | $ 4,354 | $ 4,740 | $ 3,368
Restricted Stock or Unit Expense | 4,354 | 4,740 | 3,368
Other long-term compensation plan | 848 | 1,262 | 1,955
Total Compensation | $ 5,202 | $ 6,002 | $ 5,323

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