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FAIR VALUE DISCLOSURES - Valuation of financial instruments measured at fair value on a recurring basis (Details) - Fair value on a recurring basis - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Equity securities | $ 320 | $ 270
Investments measured at net asset value - trading securities | 24,705 | 23,463
Quoted prices in active markets for identical assets (Level 1) |  |
Assets: |  |
Equity securities | 320 | 270
Significant other observable inputs (Level 2) |  |
Assets: |  |
Equity securities | 0 | 0
Significant unobservable inputs (Level 3) |  |
Assets: |  |
Equity securities | $ 0 | $ 0

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + 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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