PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Maintenance agreements, current portion	$ 2,435	$ 5,600
Income taxes receivable	8,229	7,940
Prepaid expenses	4,767	7,484
Other current assets	8,202	9,696
Total	$ 23,633	$ 30,720