LONG-TERM LIABILITIES (Schedule of Long-Term Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accounts Payable and Accrued Liabilities, Noncurrent [Abstract]
Deferred rent	$ 20,017	$ 16,896
Other long-term liabilities	1,498	725
Total long-term liabilities	$ 21,515	$ 17,621