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SUPPLEMENTAL FINANCIAL STATEMENT DATA - Accrued Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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SUPPLEMENTAL FINANCIAL STATEMENT DATA |  |
Accrued subcontractor costs | $ 34,624 | $ 19,727
Other | 5,013 | 2,750
Compensation and payroll taxes | 3,676 | 2,244
Accrued bonuses | 3,606 | 7,767
Employee withholdings | 3,396 | 2,665
Accrued workers' compensation insurance | 681 | 527
Total accrued liabilities | $ 50,996 | $ 35,680

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