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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale debt securities: |  |
Fair Value |  | $ 7,665
Municipal Obligations |  |
Available-for-sale debt securities: |  |
Fair Value |  | 1,490
Corporate Obligations |  |
Available-for-sale debt securities: |  |
Fair Value |  | 6,175
Fair value on a recurring basis |  |
Available-for-sale debt securities: |  |
Fair Value |  | 7,665
Trading securities | $ 6,278 | 5,518
Fair value on a recurring basis | Municipal Obligations |  |
Available-for-sale debt securities: |  |
Fair Value |  | 1,490
Fair value on a recurring basis | Corporate Obligations |  |
Available-for-sale debt securities: |  |
Fair Value |  | 6,175
Fair value on a recurring basis | Quoted prices in active markets for identical assets (Level 1) |  |
Available-for-sale debt securities: |  |
Fair Value |  | 0
Fair value on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Municipal Obligations |  |
Available-for-sale debt securities: |  |
Fair Value |  | 0
Fair value on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Corporate Obligations |  |
Available-for-sale debt securities: |  |
Fair Value |  | 0
Fair value on a recurring basis | Significant other observable inputs (Level 2) |  |
Available-for-sale debt securities: |  |
Fair Value |  | 7,665
Fair value on a recurring basis | Significant other observable inputs (Level 2) | Municipal Obligations |  |
Available-for-sale debt securities: |  |
Fair Value |  | 1,490
Fair value on a recurring basis | Significant other observable inputs (Level 2) | Corporate Obligations |  |
Available-for-sale debt securities: |  |
Fair Value |  | 6,175
Fair value on a recurring basis | Significant unobservable inputs (Level 3) |  |
Available-for-sale debt securities: |  |
Fair Value |  | 0
Fair value on a recurring basis | Significant unobservable inputs (Level 3) | Municipal Obligations |  |
Available-for-sale debt securities: |  |
Fair Value |  | 0
Fair value on a recurring basis | Significant unobservable inputs (Level 3) | Corporate Obligations |  |
Available-for-sale debt securities: |  |
Fair Value |  | $ 0

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