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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
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.

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- References

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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

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