CASH, CASH EQUIVALENTS AND RESTRICTED CASH (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017		Sep. 30, 2017	[2]	Dec. 31, 2016	[2]
Cash and Cash Equivalents [Abstract]
Cash	$ 166,336	$ 283,085
Cash equivalents	257,159	264,765
Total cash and cash equivalents	423,495	547,850	[1]
Restricted cash	22,121	18,554	[1]
Total cash, cash equivalents and restricted cash	$ 445,616	$ 566,404		$ 380,996		$ 289,518

[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.

[2] As of January 1, 2018, the Company adopted ASC 606 using the full retrospective method. Accordingly, the Company has recast certain amounts in the prior period presented. Also as of January 1, 2018, the Company adopted Accounting Standards Update No. 2016-18, "Statement of Cash Flows (Subtopic 230): Restricted Cash," and recast the prior period presented. See Note 1 below for additional discussion.