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EMPLOYEE BENEFIT PLANS - changes in benefit obligation, changes in plan assets, the funded status (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Change in Projected Benefit Obligation: |  |  |
Actuarial Loss (Gain) | $ 27,924 | $ 7,642 | $ 815
Defined benefit pension plan [Member] |  |  |
Change in Projected Benefit Obligation: |  |  |
Benefit Obligation at Beginning of Year | 180,830 | 149,347 | 165,084
Service Cost | 5,828 | 6,114 | 6,884
Interest Cost | 5,612 | 6,178 | 5,661
Actuarial Loss (Gain) | 32,172 | 25,715 | (16,349)
Benefits Paid | (11,677) | (6,255) | (11,686)
Expenses Paid | (260) | (269) | (247)
Special/Contractual Termination Benefits | 61 | 0 | 0
Projected Benefit Obligation at End of Year | 212,566 | 180,830 | 149,347
Change in Plan Assets: |  |  |
Fair Value of Plan Assets at Beginning of Year | 161,646 | 134,535 | 129,719
Actual Return (Loss) on Plan Assets | 17,066 | 28,635 | (6,251)
Employer Contributions | 5,000 | 5,000 | 23,000
Benefits Paid | (11,677) | (6,255) | (11,686)
Expenses Paid | (260) | (269) | (247)
Fair Value of Plan Assets at End of Year | 171,775 | 161,646 | 134,535
Funded Status of Plan and Accrued Liability Recognized at End of Year: |  |  |
Other Liabilities | 40,791 | 19,184 | 14,812
Accumulated Benefit Obligation at End of Year | 177,362 | 156,327 | 130,477
Components of Net Periodic Benefit Costs: |  |  |
Service Cost | 5,828 | 6,114 | 6,884
Interest Cost | 5,612 | 6,178 | 5,661
Expected Return on Plan Assets | (10,993) | (9,527) | (9,564)
Amortization of Prior Service Costs | 15 | 15 | 199
Special/Contractual Termination Benefits | 61 | 0 | 0
Net Loss Amortization | 3,933 | 3,862 | 3,673
Net Periodic Benefit Cost | $ 4,456 | $ 6,642 | $ 6,853
Weighted-average assumptions used to determine benefit obligations: |  |  |
Discount Rate (in percent) | 2.88% | 3.53% | 4.43%
Rate of Compensation Increase (in percent) | 4.00% | 4.00% | 4.00%
Measurement Date | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Weighted-Average Assumptions Used to Determine Benefit Cost: |  |  |
Discount Rate (in percent) | 3.53% | 4.43% | 3.71%
Expected Return on Plan Assets (in percent) | 7.00% | 7.25% | 7.25%
Rate of Compensation Increase (in percent) | 4.00% | 4.00% | 3.25%
Amortization Amounts from Accumulated Other Comprehensive Income: |  |  |
Net Actuarial Loss (Gain) | $ 26,098 | $ 6,606 | $ (533)
Prior Service Cost | (15) | (15) | (199)
Net Loss | (3,933) | (3,862) | (3,673)
Deferred Tax (Benefit) Expense | (5,615) | (694) | 1,118
Other Comprehensive Loss (Gain), net of tax | 16,535 | 2,035 | (3,287)
Amounts Recognized in Accumulated Other Comprehensive Income: |  |  |
Net Actuarial Losses | 59,400 | 37,235 | 34,491
Prior Service Cost | 35 | 50 | 66
Deferred Tax Liability (Benefit) | (15,066) | (9,451) | (8,757)
Accumulated Other Comprehensive Loss (Gain), net of tax | $ 44,369 | $ 27,834 | $ 25,800

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