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CASH, CASH EQUIVALENTS AND INVESTMENTS - Schedule of Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Line Items]
Investments, Amortized Cost Basis	$ 322,267	$ 320,563
Investments, Gross Unrealized Gains	7	1
Investments, Gross Unrealized Losses	(327)	(392)
Investments	321,947	320,172
Certificates of Deposit [Member]
Cash and Cash Equivalents [Line Items]
Cash Equivalents, at Carrying Value	1,499	1,296
Cash Equivalents, Gross Unrealized Gain	2	1
Cash Equivalents, Gross Unrealized Losses	(1)	(1)
Cash and Cash Equivalents, Fair Value Disclosure	1,500	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	189,124	104,626
Available-for-sale Securities, Gross Unrealized Gains	5
Available-for-sale Securities, Gross Unrealized Losses	(139)	(252)
Available-for-sale Securities, Fair Value Disclosure	188,990	104,374
U.S. Government Securities [Member]
Cash and Cash Equivalents [Line Items]
Cash Equivalents, at Carrying Value	41,800
Available-for-sale Debt Securities, Amortized Cost Basis	131,644	214,641
Available-for-sale Securities, Gross Unrealized Losses	(187)	(139)
Available-for-sale Securities, Fair Value Disclosure	$ 131,457	$ 214,502

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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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