OTHER LONG-TERM LIABILITIES (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Other Liabilities Disclosure [Abstract]
Deferred compensation	$ 5,407	$ 5,818
Finance Lease, Liability, Noncurrent	389	472
Other long-term liabilities	1,453	1,496
Total	$ 7,249	$ 7,786