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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension Cost (Reversal of Cost) | $ 1,041 | $ 859 | $ (628) |
Payment for Pension Benefits | 0 | 0 | 0 |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | $ 0 |  |  |
Defined Contribution Plan, Maximum Annual Contribution Percent by Employee | 50.00% |  |  |
Defined Contribution Plan, Cost | $ 0 | 0 | 1,900 |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Benefit obligation at beginning of year | 68,286 | 71,154 |  |
Service cost | 6,591 | 6,501 | 4,894 |
Interest cost | 2,778 | 2,394 | 2,325 |
Actuarial gain (loss) | 6,848 | (4,032) |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | 9,459 | 7,731 |  |
Benefit obligation at end of year | 75,044 | 68,286 | 71,154 |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets at beginning of year | 130,078 | 144,349 |  |
Actual return on plan assets | 21,197 | (6,540) |  |
Defined Benefit Plan, Plan Assets, Benefits Paid | 9,459 | 7,731 |  |
Fair value of plan assets at end of year | 141,816 | 130,078 | 144,349 |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Assets | 66,772 | 61,792 |  |
Liabilities | 0 | 0 |  |
Net amount recognized | 66,772 | 61,792 |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract] |  |  |  |
Net actuarial loss | 37,278 | 43,711 |  |
Net prior service cost | (1,095) | (1,508) |  |
Deferred tax assets | (8,242) | (9,613) |  |
Net amount recognized | 27,941 | 32,590 | 19,631 | $ 22,803
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | (4,649) | 8,180 | (3,172) |
Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment and Disproportionate Tax Effect Net Of Tax |  | 12,959 |  |
Accumulated benefit obligation | 74,424 | 66,320 |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 6,591 | 6,501 | 4,894 |
Interest cost | 2,778 | 2,394 | 2,325 |
Expected return on plan assets | (9,718) | (9,811) | (9,358) |
Amortization of prior service cost | (413) | (413) | (413) |
Defined Benefit Plan, Amortization of Gain (Loss) | 1,803 | 2,188 | 1,924 |
Net periodic benefit (income) cost | 1,041 | 859 | (628) |
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 | (4,630) | 12,319 | (2,775) |
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 | 413 | 413 |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | (1,803) | (2,188) | (1,924) |
Total recognized in accumulated other comprehensive income | (6,020) | 10,544 | (4,286) |
Total recognized in net periodic benefit cost and accumulated other comprehensive income | (4,979) | 11,403 | (4,914) |
Amortization of loss | 2,079 | 1,867 | 2,090 |
Amortization of prior service credit | $ (413) | $ (413) | $ (413) |
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] |  |  |  |
Discount rate | 3.33% | 4.31% | 3.43% |
Rate of compensation increase | 3.50% | 3.50% | 3.50% |
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |
Discount rate | 4.31% | 3.43% | 3.88% |
Expected return on plan assets | 7.25% | 7.25% | 7.25% |
Rate of compensation increase | 3.50% | 3.50% | 3.50% |
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract] |  |  |  |
2020 | $ 5,611 |  |  |
2021 | 5,210 |  |  |
2022 | 5,173 |  |  |
2023 | 5,125 |  |  |
2024 | 6,070 |  |  |
Thereafter | $ 35,362 |  |  |

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