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Equity Awards and Instruments - Stock Grants Narrative (Details) - Class B Common Stock - 2020 Incentive Award Plan - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Fully vested shares granted (in shares) | 7,824 | 17,411
Fully vested shares granted | $ 450 | $ 219

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