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FINANCIAL INSTRUMENTS (Details 2) - USD ($) $ in Thousands | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Oct. 31, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
Fair Value Measurements |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 15,000 |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  |  | $ 10,000
Summary of Investments, Other than Investments in Related Parties, Carrying Amount |  | $ 14,146 | $ 14,146 |
Investments, Contingent Purchase Obligation |  |  | 900 |
Level 2 |  |  |  |
Fair Value Measurements |  |  |  |
Cost |  | 256,596 | 317,722 |
Gross Unrealized Gains |  | 8 | 0 |
Gross Unrealized Losses |  | (553) | (454) |
Fair Value |  | 256,051 | 317,268 |
Short-term Investments | Level 2 |  |  |  |
Fair Value Measurements |  |  |  |
Cost |  | 254,994 | 257,456 |
Gross Unrealized Gains |  | 8 | 0 |
Gross Unrealized Losses |  | (552) | (235) |
Fair Value |  | 254,450 | 257,221 |
Short-term Investments | Asset-backed securities | Level 2 |  |  |  |
Fair Value Measurements |  |  |  |
Cost |  | 47,341 | 28,338 |
Gross Unrealized Gains |  | 0 | 0 |
Gross Unrealized Losses |  | (152) | (37) |
Fair Value |  | 47,189 | 28,301 |
Short-term Investments | Commercial paper | Level 2 |  |  |  |
Fair Value Measurements |  |  |  |
Cost |  | 72,447 | 48,999 |
Gross Unrealized Gains |  | 8 | 0 |
Gross Unrealized Losses |  | (3) | (23) |
Fair Value |  | 72,452 | 48,976 |
Short-term Investments | Corporate bonds | Level 2 |  |  |  |
Fair Value Measurements |  |  |  |
Cost |  | 135,206 | 180,119 |
Gross Unrealized Gains |  | 0 | 0 |
Gross Unrealized Losses |  | (397) | (175) |
Fair Value |  | 134,809 | 179,944 |
Long-Term Investments | Level 2 |  |  |  |
Fair Value Measurements |  |  |  |
Cost |  | 1,602 | 60,266 |
Gross Unrealized Gains |  | 0 | 0 |
Gross Unrealized Losses |  | (1) | (219) |
Fair Value |  | 1,601 | 60,047 |
Long-Term Investments | Asset-backed securities | Level 2 |  |  |  |
Fair Value Measurements |  |  |  |
Cost |  |  | 23,836 |
Gross Unrealized Gains |  |  | 0 |
Gross Unrealized Losses |  |  | (79) |
Fair Value |  |  | 23,757 |
Long-Term Investments | Corporate bonds | Level 2 |  |  |  |
Fair Value Measurements |  |  |  |
Cost |  | 1,602 | 36,430 |
Gross Unrealized Gains |  | 0 | 0 |
Gross Unrealized Losses |  | (1) | (140) |
Fair Value |  | $ 1,601 | $ 36,290 |

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