PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Income taxes receivable	$ 8,286	$ 7,053
Maintenance agreements, current portion	2,288	2,513
Prepaid expenses	3,096	4,812
Other current assets	5,211	5,101
Total	$ 18,881	$ 19,479