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Supplemental Consolidated Balance Sheet Information - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Accrued Liabilities and Other Liabilities [Abstract] |  |
Accrued vacation | $ 10,824 | $ 8,353
Accrued commissions | 5,570 | 5,561
Accrued bonuses | 7,999 | 7,121
Estimated health insurance claims | 1,076 | 1,040
ESPP employee contributions | 3,862 | 3,734
Customer deposits | 13,526 | 12,151
Operating lease liabilities | 4,385 | 3,064
Accrued other liabilities | 9,145 | 8,906
Accrued expenses and other current liabilities | $ 56,387 | $ 49,930

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