PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Maintenance agreements, current portion	$ 1,442	$ 5,600
Income taxes receivable	6,287	7,940
Prepaid expenses	4,313	7,484
Other current assets	4,212	9,696
Total	$ 16,254	$ 30,720