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CASH, CASH EQUIVALENTS AND INVESTMENTS - Schedule of Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Line Items]
Investments, Amortized Cost Basis	$ 415,056	$ 320,563
Investments, Gross Unrealized Gains	5	1
Investments, Gross Unrealized Losses	(121)	(392)
Investments	414,940	320,172
Certificates of Deposit [Member]
Cash and Cash Equivalents [Line Items]
Cash Equivalents, at Carrying Value	400	1,296
Cash Equivalents, Gross Unrealized Gain		1
Cash Equivalents, Gross Unrealized Losses		(1)
Cash and Cash Equivalents, Fair Value Disclosure	400	1,296
Corporate Debt Securities [Member]
Cash and Cash Equivalents [Line Items]
Cash Equivalents, at Carrying Value		17,900
Available-for-sale Debt Securities, Amortized Cost Basis	188,832	104,626
Available-for-sale Securities, Gross Unrealized Gains	4
Available-for-sale Securities, Gross Unrealized Losses	(45)	(252)
Available-for-sale Securities, Fair Value Disclosure	188,791	104,374
U.S. Government Securities [Member]
Cash and Cash Equivalents [Line Items]
Cash Equivalents, at Carrying Value	23,000
Available-for-sale Debt Securities, Amortized Cost Basis	225,824	214,641
Available-for-sale Securities, Gross Unrealized Gains	1
Available-for-sale Securities, Gross Unrealized Losses	(76)	(139)
Available-for-sale Securities, Fair Value Disclosure	$ 225,749	$ 214,502

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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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