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FAIR VALUE (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair value
Restricted investment securities - trading	$ 1,150	$ 1,308
Total assets measured at fair value on a recurring basis	1,150	1,308
Level 1 - Quoted Prices in Active Markets for Identical Assets
Fair value
Restricted investment securities - trading	1,150	1,308
Total assets measured at fair value on a recurring basis	1,150	1,308
Level 2 - Significant Other Observable Inputs
Fair value
Restricted investment securities - trading	0	0
Total assets measured at fair value on a recurring basis	0	0
Level 3 - Significant Unobservable Inputs
Fair value
Restricted investment securities - trading	0	0
Total assets measured at fair value on a recurring basis	$ 0	$ 0

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

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+ References

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