ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Compensation and other employee-related costs	$ 29,006	$ 23,214
Legal and other settlements and expenses	1,177	734
Accrual for Taxes Other than Income Taxes	6,325	6,946
Royalties	2,139	4,671
Other	13,947	10,836
Total accrued expenses	$ 52,594	$ 46,401