COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2017	$ 4,872
2018	4,253
2019	3,835
2020	3,145
2021	2,496
2022 and thereafter	6,263
Total minimum payments	24,864
Operating Leases, Rent Expense, Net [Abstract]
Rent expense	4,900	$ 4,500	$ 4,500
Tax Contingency, Accrual for Unrecognized Tax Benefits	$ 300