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Basis of Presentation and Nature of Operations - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Payables And Accruals [Abstract] |  |
Deposits | $ 14,069 | $ 9,881
Restricted deposits | 34,404 | 68,138
Accrued IT and software licensing costs | 1,445 | 2,157
Accrued taxes and insurance premiums | 3,504 | 4,327
Accrued facilities rental and lease exit costs | 1,351 | 780
Accrued interest | 236 | 214
Accrued professional services | 3,825 | 2,094
Accrued dividends | 2,641 | 2,641
Contingent liabilities from acquisitions |  | 683
Interest rate swap liability - current | 3,584 | 3,693
Other accrued expenses and current liabilities | 5,376 | 6,300
Total accrued expenses and other current liabilities | $ 70,435 | $ 100,908

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