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FINANCIAL INSTRUMENTS (Details 2) - Level 2 - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value Measurements |  |
Cost | $ 328,692 | $ 136,683
Gross Unrealized Gains | 24 | 19
Gross Unrealized Losses | (88) | (49)
Fair Value | 328,628 | 136,653
Short-term Investments | Asset-backed securities |  |
Fair Value Measurements |  |
Cost | 69,984 | 9,012
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (15) | (2)
Fair Value | 69,969 | 9,010
Short-term Investments | Commercial paper |  |
Fair Value Measurements |  |
Cost | 35,896 | 39,530
Gross Unrealized Gains | 3 | 8
Gross Unrealized Losses | (1) | (15)
Fair Value | 35,898 | 39,523
Short-term Investments | Corporate bonds |  |
Fair Value Measurements |  |
Cost | 222,812 | 88,141
Gross Unrealized Gains | 21 | 11
Gross Unrealized Losses | (72) | (32)
Fair Value | $ 222,761 | $ 88,120

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