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CASH, CASH EQUIVALENTS AND INVESTMENTS - Schedule of Cash, Cash Equivalents (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Cash And Cash Equivalents [Line Items]
Cash Equivalents, at Carrying Value	$ 324,242	$ 211,013
Cash Equivalents, Gross Unrealized Gains	35	9
Cash and Cash Equivalents, Fair Value Disclosure	324,277	211,022
Cash Accounts in Banking Institutions [Member]
Cash And Cash Equivalents [Line Items]
Cash Equivalents, at Carrying Value	85,749	71,217
Cash and Cash Equivalents, Fair Value Disclosure	85,749	71,217
Money Market Accounts [Member]
Cash And Cash Equivalents [Line Items]
Cash Equivalents, at Carrying Value	8,917	11,014
Cash and Cash Equivalents, Fair Value Disclosure	8,917	11,014
U.S. Government Bonds [Member]
Cash And Cash Equivalents [Line Items]
Cash Equivalents, at Carrying Value	229,576	128,782
Cash Equivalents, Gross Unrealized Gains	35	9
Cash and Cash Equivalents, Fair Value Disclosure	$ 229,611	$ 128,791

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Cash Equivalents, Gross Unrealized Gain

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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