PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Maintenance agreements, current portion	$ 5,600	$ 8,014
Income taxes receivable	7,940	9,227
Prepaid expenses	7,484	7,898
Other current assets	9,696	10,198
Total	$ 30,720	$ 35,337