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Supplemental Consolidated Balance Sheet Information - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accrued Liabilities and Other Liabilities [Abstract] |  |
Accrued vacation | $ 11,876 | $ 10,294
Accrued commissions | 6,975 | 12,678
Accrued bonuses | 16,579 | 6,573
Accrued payroll | 3,013 | 2,631
Estimated health insurance claims | 1,605 | 1,224
Accrued interest | 485 | 1,455
ESPP employee contributions | 2,941 | 4,269
Customer deposits | 24,592 | 18,283
Operating lease liabilities | 4,233 | 4,541
Accrued other liabilities | 6,500 | 6,308
Accrued expenses and other current liabilities | $ 78,799 | $ 68,256

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