INFORMATION ABOUT REVENUE AND GEOGRAPHIC AREAS (Long-Lived Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 94,348	$ 92,440
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	91,087	89,362
All other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 3,261	$ 3,078