OTHER LONG-TERM LIABILITIES (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Other Liabilities Disclosure [Abstract]
Deferred compensation	$ 5,533	$ 5,818
Finance Lease, Liability, Noncurrent	452	472
Other long-term liabilities	1,486	1,496
Total	$ 7,471	$ 7,786