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EMPLOYEE BENEFIT PLANS - Asset allocation (Details) - Defined Benefit Pension Items [Member]	Dec. 31, 2019	Dec. 31, 2018
ASSET CATEGORY:
Asset allocations	100.00%	100.00%
Cash and Cash Equivalents [Member]
ASSET CATEGORY:
Asset allocations	1.00%	49.00%
Domestic equities [Member]
ASSET CATEGORY:
Asset allocations	8.00%	7.00%
Mutual funds/ETFs
ASSET CATEGORY:
Asset allocations	82.00%	42.00%
International equities
ASSET CATEGORY:
Asset allocations	1.00%	0.00%
Corporate bonds
ASSET CATEGORY:
Asset allocations	8.00%	2.00%

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- References

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- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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