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CASH EQUIVALENTS AND INVESTMENTS - Schedule of Cash Equivalents and Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Investments, Amortized Cost Basis | $ 248,951 | $ 300,333
Investments, Gross Unrealized Gains | 10 | 4
Investments, Gross Unrealized Losses | (382) | (169)
Investments | 248,579 | 300,168
Certificates of Deposit [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash Equivalents, at Carrying Value | 3,362 | 11,532
Cash Equivalents, Gross Unrealized Gain | 3 | 3
Cash Equivalents, Gross Unrealized Losses |  | (14)
Cash and Cash Equivalents, Fair Value Disclosure | 3,365 | 11,521
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 |
Corporate Debt Securities [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash Equivalents, at Carrying Value | 14,975 |
Available-for-sale Debt Securities, Amortized Cost Basis | 209,595 | 233,848
Available-for-sale Securities, Gross Unrealized Gains | 6 |
Available-for-sale Securities, Gross Unrealized Losses | (377) | (139)
Available-for-sale Securities, Fair Value Disclosure | 209,224 | 233,709
US Treasury and Government [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash Equivalents, at Carrying Value | 30,000 |
Available-for-sale Debt Securities, Amortized Cost Basis | 32,996 | 54,953
Available-for-sale Securities, Gross Unrealized Gains | 1 | 1
Available-for-sale Securities, Gross Unrealized Losses | (3) | (16)
Available-for-sale Securities, Fair Value Disclosure | $ 32,994 | $ 54,938

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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=73527792&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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- Definition 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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