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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - AOCI reclassifications (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
AOIC reclassifications
Amounts reclassified from accumulated other comprehensive income, net of tax	$ (64)	$ 54	$ (328)
Pension and other postretirement benefit plans
AOIC reclassifications
Amounts reclassified from accumulated other comprehensive income, net of tax	$ (64)	$ 54	716
Investment
AOIC reclassifications
Amounts reclassified from accumulated other comprehensive income, net of tax			$ (1,044)

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581

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