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Employee Benefits - Summary of Workers' Compensation Known Claims and IBNR Reserves (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Postemployment Benefits [Abstract]    
Included in other current liabilities $ 6,775 $ 7,703
Included in other long-term liabilities 12,490 11,986
Workers' compensation liability $ 19,265 $ 19,689