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WORKERS' COMPENSATION - Workers' Liability (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Workers' Liability [Roll Forward]    
Beginning balance $ 7,925 $ 10,164
Claims and valuation adjustments (160) 1,646
Payments (92) (75)
Ending balance 7,673 11,735
Less: current portion 1,169 1,882
Long-term workers' compensation liability $ 6,504 $ 9,853