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Compensation Plans - 401(k) Plan (Details) - 401K - 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] |  |  |
Issuance of common stock related to 401k plan match (in shares) | 20,976 | 17,651 | 11,967
Expenses attributable to the 401(k) Plan | $ 2,511,746 | $ 2,496,936 | $ 2,231,735

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