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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Maintenance agreements, current portion $ 3,939 $ 5,600
Income taxes receivable 11,880 7,940
Prepaid expenses 6,903 7,484
Other current assets 6,570 9,696
Total $ 29,292 $ 30,720