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CASH, CASH EQUIVALENTS AND INVESTMENTS - Schedule of Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Cash and Cash Equivalents [Line Items] |  |
Investments, Amortized Cost Basis | $ 320,563 | $ 248,951
Investments, Gross Unrealized Gains | 1 | 10
Investments, Gross Unrealized Losses | (392) | (382)
Investments | 320,172 | 248,579
Certificates of Deposit [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash Equivalents, at Carrying Value | 1,296 | 3,362
Cash Equivalents, Gross Unrealized Gain | 1 | 3
Cash Equivalents, Gross Unrealized Losses | (1) |
Cash and Cash Equivalents, Fair Value Disclosure | 1,296 | 3,365
Corporate Debt Securities [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash Equivalents, at Carrying Value | 17,900 | 15,000
Available-for-sale Debt Securities, Amortized Cost Basis | 104,626 | 209,595
Available-for-sale Securities, Gross Unrealized Gains |  | 6
Available-for-sale Securities, Gross Unrealized Losses | (252) | (377)
Available-for-sale Securities, Fair Value Disclosure | 104,374 | 209,224
U.S. Government Bonds [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash Equivalents, at Carrying Value | 0 | 30,000
Available-for-sale Debt Securities, Amortized Cost Basis | 214,641 | 32,996
Available-for-sale Securities, Gross Unrealized Gains |  | 1
Available-for-sale Securities, Gross Unrealized Losses | (139) | (3)
Available-for-sale Securities, Fair Value Disclosure | $ 214,502 | 32,994
Money Market Instruments [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash Equivalents, at Carrying Value |  | 2,998
Cash Equivalents, Gross Unrealized Losses |  | (2)
Cash and Cash Equivalents, Fair Value Disclosure |  | $ 2,996

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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