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EMPLOYEE BENEFIT PLANS (Assumptions Used) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Benefits [Member] |  |  |
Weighted Average Assumptions Used to Determine Benefit Obligations |  |  |
Discount rate | 2.36% | 3.21% |
Rate of compensation increase | 4.28% | 4.28% |
Weighted Average Assumptions Used to Determine Net Periodic Benefit Costs |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate | 2.19% | 3.34% | 2.88%
Expected long-term rate of return on plan assets | 5.75% | 6.00% | 6.25%
Rate of compensation increase | 4.28% | 4.55% | 4.53%
Supplemental Employee Retirement Plan [Member] |  |  |
Weighted Average Assumptions Used to Determine Benefit Obligations |  |  |
Discount rate | 2.21% | 3.09% |
Rate of compensation increase | 4.50% | 4.50% |
Weighted Average Assumptions Used to Determine Net Periodic Benefit Costs |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate | 2.19% | 3.34% | 2.88%
Rate of compensation increase | 4.50% | 5.00% | 5.00%
Post Retirement Medical Plan [Member] |  |  |
Weighted Average Assumptions Used to Determine Benefit Obligations |  |  |
Discount rate | 1.90% | 2.88% |
Rate of compensation increase | 0.00% | 0.00% |
Service Cost [Member] | Pension Benefits [Member] |  |  |
Weighted Average Assumptions Used to Determine Net Periodic Benefit Costs |  |  |
Discount rate | 2.94% | 4.24% | 3.62%
Service Cost [Member] | Supplemental Employee Retirement Plan [Member] |  |  |
Weighted Average Assumptions Used to Determine Net Periodic Benefit Costs |  |  |
Discount rate | 2.79% | 4.19% | 3.58%
Service Cost [Member] | Post Retirement Medical Plan [Member] |  |  |
Weighted Average Assumptions Used to Determine Net Periodic Benefit Costs |  |  |
Discount rate | 2.86% | 4.21% | 3.59%
Effective rate for interest cost [Member] | Pension Benefits [Member] |  |  |
Weighted Average Assumptions Used to Determine Net Periodic Benefit Costs |  |  |
Discount rate | 2.50% | 3.92% | 3.21%
Effective rate for interest cost [Member] | Supplemental Employee Retirement Plan [Member] |  |  |
Weighted Average Assumptions Used to Determine Net Periodic Benefit Costs |  |  |
Discount rate | 2.33% | 3.83% | 3.15%
Effective rate for interest cost [Member] | Post Retirement Medical Plan [Member] |  |  |
Weighted Average Assumptions Used to Determine Net Periodic Benefit Costs |  |  |
Discount rate | 2.21% | 3.69% | 2.97%
Effective rate for interest on service cost [Member] | Pension Benefits [Member] |  |  |
Weighted Average Assumptions Used to Determine Net Periodic Benefit Costs |  |  |
Discount rate | 2.59% | 4.00% | 3.32%
Effective rate for interest on service cost [Member] | Supplemental Employee Retirement Plan [Member] |  |  |
Weighted Average Assumptions Used to Determine Net Periodic Benefit Costs |  |  |
Discount rate | 2.42% | 3.90% | 3.24%
Effective rate for interest on service cost [Member] | Post Retirement Medical Plan [Member] |  |  |
Weighted Average Assumptions Used to Determine Net Periodic Benefit Costs |  |  |
Discount rate | 2.68% | 4.09% | 3.46%

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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 increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related 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)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, 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)(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 Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related 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)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted-average interest crediting rate used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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