THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Restricted cash narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Restricted cash in other long-term assets, as reported on the balance sheets	$ 0	$ 7,884	$ 7,931