LONG-TERM LIABILITIES (Schedule of Long-Term Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Deferred rent	$ 30,446	$ 26,904
Other long-term liabilities	4,532	3,833
Total long-term liabilities	$ 34,978	$ 30,737	[1]

[1] As of January 1, 2018, the Company adopted Accounting Standards Update 2014-09, "Revenue from Contracts with Customers (Topic 606)" ("ASC 606"), using the full retrospective method. Accordingly, the Company has recast certain amounts in the prior period presented. See Note 1 below for additional discussion.