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EMPLOYEE BENEFIT PLANS (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension Cost (Reversal of Cost) | $ 2,484,000 | $ 1,041,000 | $ 859,000 |
Payment for Pension Benefits | $ 0 | 0 | 0 |
Defined Contribution Plan, Maximum Annual Contribution Percent by Employee | 50.00% |  |  |
Defined Contribution Plan, Cost | $ 0 | 0 | 0 |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | 0 |  |  |
Change in Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 0.0078 |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Benefit obligation at beginning of year | 75,044,000 | 68,286,000 |  |
Service cost | 7,932,000 | 6,591,000 | 6,501,000 |
Interest cost | 2,455,000 | 2,778,000 | 2,394,000 |
Actuarial gain (loss) | 9,171,000 | 6,848,000 |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | 7,108,000 | 9,459,000 |  |
Benefit obligation at end of year | 87,494,000 | 75,044,000 | 68,286,000 |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 141,816,000 | 130,078,000 |  |
Actual return on plan assets | 20,996,000 | 21,197,000 |  |
Defined Benefit Plan, Plan Assets, Benefits Paid | 7,108,000 | 9,459,000 |  |
Fair value of plan assets at end of year | 155,704,000 | 141,816,000 | 130,078,000 |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Assets | 68,210,000 | 66,772,000 |  |
Liabilities | 0 | 0 |  |
Net amount recognized | 68,210,000 | 66,772,000 |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract] |  |  |  |
Net actuarial loss | 32,943,000 | 37,278,000 |  |
Net prior service cost | (682,000) | (1,095,000) |  |
Deferred tax assets | (7,349,000) | (8,242,000) |  |
Net amount recognized | 24,912,000 | 27,941,000 | 32,590,000 | $ 19,631,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | (3,029,000) | (4,649,000) | 8,180,000 |
Accumulated benefit obligation | 86,327,000 | 74,424,000 |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 7,932,000 | 6,591,000 | 6,501,000 |
Interest cost | 2,455,000 | 2,778,000 | 2,394,000 |
Expected return on plan assets | (9,824,000) | (9,718,000) | (9,811,000) |
Amortization of prior service cost | (413,000) | (413,000) | (413,000) |
Defined Benefit Plan, Amortization of Gain (Loss) | 2,334,000 | 1,803,000 | 2,188,000 |
Net periodic benefit (income) cost | 2,484,000 | 1,041,000 | 859,000 |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract] |  |  |  |
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax | (2,001,000) | (4,630,000) | 12,319,000 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax | 0 | 0 | 0 |
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost, before Tax | 413,000 | 413,000 | 413,000 |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | (2,334,000) | (1,803,000) | (2,188,000) |
Total recognized in accumulated other comprehensive income | (3,922,000) | (6,020,000) | 10,544,000 |
Total recognized in net periodic benefit cost and accumulated other comprehensive income | $ (1,438,000) | $ (4,979,000) | $ 11,403,000 |
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] |  |  |  |
Discount rate | 2.55% | 3.33% | 4.31% |
Rate of compensation increase | 3.50% | 3.50% | 3.50% |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate | 2.14% | 2.82% | 3.61% |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |
Discount rate | 3.33% | 4.31% | 3.43% |
Expected return on plan assets | 7.25% | 7.25% | 7.25% |
Rate of compensation increase | 3.50% | 3.50% | 3.50% |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate | 2.82% | 3.61% | 2.63% |
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract] |  |  |  |
2021 | $ 5,780,000 |  |  |
2022 | 5,432,000 |  |  |
2023 | 5,474,000 |  |  |
2024 | 6,605,000 |  |  |
2025 | 6,565,000 |  |  |
Thereafter | $ 38,095,000 |  |  |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1731-114919 + Details
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- Definition Amount of cash outflow for pension benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes other postretirement benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585 + Details
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- Definition Amount of cost (reversal of cost) for pension benefits. Excludes other postretirement benefits. + References No definition available. + Details
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