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FAIR VALUE MEASUREMENTS - Summary of valuation of financial instruments measured at fair value on recurring basis (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Available-for-sale securities |  |
Available-for-sale securities: | $ 7,665 | $ 13,031
Fair value on a recurring basis |  |
Available-for-sale securities |  |
Available-for-sale securities: | 7,665 | 13,031
Investments measured at Net Asset Value - Trading securities | 5,518 | 6,031
Fair value on a recurring basis | Municipal Obligations |  |
Available-for-sale securities |  |
Available-for-sale securities: | 1,490 | 13,031
Fair value on a recurring basis | Corporate Obligations |  |
Available-for-sale securities |  |
Available-for-sale securities: | 6,175 | 0
Fair value on a recurring basis | Quoted prices in active markets for identical assets, Level 1 |  |
Available-for-sale securities |  |
Available-for-sale securities: | 0 | 0
Fair value on a recurring basis | Quoted prices in active markets for identical assets, Level 1 | Municipal Obligations |  |
Available-for-sale securities |  |
Available-for-sale securities: | 0 | 0
Fair value on a recurring basis | Quoted prices in active markets for identical assets, Level 1 | Corporate Obligations |  |
Available-for-sale securities |  |
Available-for-sale securities: | 0 | 0
Fair value on a recurring basis | Significant other observable inputs, Level 2 |  |
Available-for-sale securities |  |
Available-for-sale securities: | 7,665 | 13,031
Fair value on a recurring basis | Significant other observable inputs, Level 2 | Municipal Obligations |  |
Available-for-sale securities |  |
Available-for-sale securities: | 1,490 | 13,031
Fair value on a recurring basis | Significant other observable inputs, Level 2 | Corporate Obligations |  |
Available-for-sale securities |  |
Available-for-sale securities: | 6,175 | 0
Fair value on a recurring basis | Significant unobservable inputs, Level 3 |  |
Available-for-sale securities |  |
Available-for-sale securities: | 0 | 0
Fair value on a recurring basis | Significant unobservable inputs, Level 3 | Municipal Obligations |  |
Available-for-sale securities |  |
Available-for-sale securities: | 0 | 0
Fair value on a recurring basis | Significant unobservable inputs, Level 3 | Corporate Obligations |  |
Available-for-sale securities |  |
Available-for-sale securities: | $ 0 | $ 0

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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