OTHER LONG-TERM LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Long-term deferred rent	$ 5,122	$ 2,970
Long-term accrued restructuring	188	731
Long-term deferred compensation	4,992	5,546
Total long-term liabilities	$ 10,302	$ 9,247