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Basis of Presentation - VIE - Additional Information (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Variable Interest Entity |  |
Payroll tax withholdings | $ 12,961,000 |
Primary Beneficiary |  |
Variable Interest Entity |  |
Liabilities of the deferred compensation plan | 7,087,000 | $ 7,961,000
Assets held in the related rabbi trust | $ 11,542,000 | $ 16,323,000

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