OTHER ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Other Liabilities Disclosure [Abstract]
Accrued and deferred compensation	$ 22,671	$ 19,473
Accrued benefits and workers' compensation claims	5,923	5,733
Unearned revenue and customer deposits	3,937	2,172
Due to contracts and agencies	3,051	3,305
Current portion of operating lease	1,802	1,757
Other	5,163	4,123
Total other accrued liabilities	$ 42,547	$ 36,563
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Total other accrued liabilities	Total other accrued liabilities