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CASH, CASH EQUIVALENTS AND INVESTMENTS - Schedule of Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Cash and Cash Equivalents [Line Items]
Investments, Amortized Cost Basis	$ 316,263	$ 248,951
Investments, Gross Unrealized Gains	33	10
Investments, Gross Unrealized Losses	(223)	(382)
Investments	316,073	248,579
Certificates of Deposit [Member]
Cash and Cash Equivalents [Line Items]
Cash Equivalents, at Carrying Value	1,230	3,362
Cash Equivalents, Gross Unrealized Gain	2	3
Cash and Cash Equivalents, Fair Value Disclosure	1,232	3,365
Commercial Paper [Member]
Cash and Cash Equivalents [Line Items]
Cash Equivalents, at Carrying Value		2,998
Cash Equivalents, Gross Unrealized Losses	0	(2)
Cash and Cash Equivalents, Fair Value Disclosure		2,996
Corporate Debt Securities [Member]
Cash and Cash Equivalents [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	69,886	209,595
Available-for-sale Securities, Gross Unrealized Gains	6	6
Available-for-sale Securities, Gross Unrealized Losses	(206)	(377)
Available-for-sale Securities, Fair Value Disclosure	69,686	209,224
U.S. Government Securities [Member]
Cash and Cash Equivalents [Line Items]
Cash Equivalents, at Carrying Value	5,000
Available-for-sale Debt Securities, Amortized Cost Basis	245,147	32,996
Available-for-sale Securities, Gross Unrealized Gains	25	1
Available-for-sale Securities, Gross Unrealized Losses	(17)	(3)
Available-for-sale Securities, Fair Value Disclosure	$ 245,155	$ 32,994

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as 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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Sum of the carrying amounts as of the balance sheet date of all investments.

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