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EMPLOYEE RETIREMENT PLANS - Schedule of net periodic pension cost (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate for determining projected benefit obligation | 3.36% | 4.39%
Long-term rate of return on plan assets | 7.00% | 7.00%
Defined Benefit Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate for determining projected benefit obligation | 4.38% | 3.70%
Discount rate in effect for determining service cost | 0.00% | 0.00%
Discount rate in effect for determining interest cost | 4.05% | 3.33%
Long-term rate of return on plan assets | 7.00% | 7.00%
Supplemental Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate for determining projected benefit obligation | 4.42% | 3.75%
Discount rate in effect for determining service cost | 0.00% | 3.83%
Discount rate in effect for determining interest cost | 4.19% | 3.51%
Long-term rate of return on plan assets | 0.00% | 0.00%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money relating to determining interest cost. + References No definition available. + Details
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