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FAIR VALUE MEASUREMENTS - Summary of valuation of financial instruments measured at fair value on recurring basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale securities
Available-for-sale securities	$ 11,512	$ 13,031
Fair Value, Measurements, Recurring | Fair value measurement
Assets:
Investments measured at Net Asset Value - Trading securities	5,944	6,031
Available-for-sale securities
Available-for-sale securities	11,512	13,031
Fair Value, Measurements, Recurring | Fair value measurement | Municipal Obligations
Available-for-sale securities
Available-for-sale securities	9,764	13,031
Fair Value, Measurements, Recurring | Fair value measurement | Corporate Obligations
Available-for-sale securities
Available-for-sale securities	1,748	0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets, Level 1 | Fair value measurement
Available-for-sale securities
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets, Level 1 | Fair value measurement | Municipal Obligations
Available-for-sale securities
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets, Level 1 | Fair value measurement | Corporate Obligations
Available-for-sale securities
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring | Significant other observable inputs, Level 2 | Fair value measurement
Available-for-sale securities
Available-for-sale securities	11,512	13,031
Fair Value, Measurements, Recurring | Significant other observable inputs, Level 2 | Fair value measurement | Municipal Obligations
Available-for-sale securities
Available-for-sale securities	9,764	13,031
Fair Value, Measurements, Recurring | Significant other observable inputs, Level 2 | Fair value measurement | Corporate Obligations
Available-for-sale securities
Available-for-sale securities	1,748	0
Fair Value, Measurements, Recurring | Significant unobservable inputs, Level 3 | Fair value measurement
Available-for-sale securities
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring | Significant unobservable inputs, Level 3 | Fair value measurement | Municipal Obligations
Available-for-sale securities
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring | Significant unobservable inputs, Level 3 | Fair value measurement | Corporate Obligations
Available-for-sale securities
Available-for-sale securities	$ 0	$ 0

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

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- References

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- Definition

Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

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