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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
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Change in Projected Benefit Obligation: |  |  |
Actuarial (Gain) Loss | $ (31,339) | $ 27,924 | $ 7,642
Components of Net Periodic Benefit Costs: |  |  |
Defined benefit plan settlement | 3,072 | 0 | 0
Defined benefit pension plan [Member] |  |  |
Change in Projected Benefit Obligation: |  |  |
Benefit Obligation at Beginning of Year | 212,566 | 180,830 | 149,347
Service Cost | 6,971 | 5,828 | 6,114
Interest Cost | 4,885 | 5,612 | 6,178
Actuarial (Gain) Loss | (14,934) | 32,172 | 25,715
Benefits Paid | (2,087) | (11,677) | (6,255)
Expenses Paid | (259) | (260) | (269)
Settlements | (34,634) | 0 | 0
Special/Contractual Termination Benefits | 0 | 61 | 0
Projected Benefit Obligation at End of Year | 172,508 | 212,566 | 180,830
Change in Plan Assets: |  |  |
Fair Value of Plan Assets at Beginning of Year | 171,775 | 161,646 | 134,535
Actual Return (Loss) on Plan Assets | 30,479 | 17,066 | 28,635
Employer Contributions | 0 | 5,000 | 5,000
Benefits Paid | (2,087) | (11,677) | (6,255)
Expenses Paid | (259) | (260) | (269)
Settlements | (34,634) | 0 | 0
Fair Value of Plan Assets at End of Year | 165,274 | 171,775 | 161,646
Funded Status of Plan and Accrued Liability Recognized at End of Year: |  |  |
Other Liabilities | 7,234 | 40,791 | 19,184
Accumulated Benefit Obligation at End of Year | 149,569 | 177,362 | 156,327
Components of Net Periodic Benefit Costs: |  |  |
Service Cost | 6,971 | 5,828 | 6,114
Interest Cost | 4,885 | 5,612 | 6,178
Expected Return on Plan Assets | (11,147) | (10,993) | (9,527)
Amortization of Prior Service Costs | 15 | 15 | 15
Special/Contractual Termination Benefits | 0 | 61 | 0
Net Loss Amortization | 6,764 | 3,933 | 3,862
Defined benefit plan settlement | 3,072 | 0 | 0
Net Periodic Benefit Cost | $ 10,560 | $ 4,456 | $ 6,642
Weighted-average assumptions used to determine benefit obligations: |  |  |
Discount Rate (in percent) | 3.11% | 2.88% | 3.53%
Rate of Compensation Increase (in percent) | 4.40% | 4.00% | 4.00%
Measurement Date | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Weighted-Average Assumptions Used to Determine Benefit Cost: |  |  |
Discount Rate (in percent) | 2.88% | 3.53% | 4.43%
Expected Return on Plan Assets (in percent) | 6.75% | 7.00% | 7.25%
Rate of Compensation Increase (in percent) | 4.00% | 4.00% | 4.00%
Amortization Amounts from Accumulated Other Comprehensive Income: |  |  |
Net Actuarial Loss (Gain) | $ (34,265) | $ 26,098 | $ 6,606
Prior Service Cost | (15) | (15) | (15)
Net Loss | (9,836) | (3,933) | (3,862)
Deferred Tax (Benefit) Expense | 11,183 | (5,615) | (694)
Other Comprehensive Loss (Gain), net of tax | (32,933) | 16,535 | 2,035
Amounts Recognized in Accumulated Other Comprehensive Income: |  |  |
Net Actuarial Losses | 15,300 | 59,400 | 37,235
Prior Service Cost | 20 | 35 | 50
Deferred Tax Benefit | (3,884) | (15,066) | (9,451)
Accumulated Other Comprehensive Loss, net of tax | $ 11,436 | $ 44,369 | $ 27,834

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- Definition Month-end measurement date applicable when an accounting policy election is made to measure plan assets and benefit obligations as of the month-end that is closest to the fiscal year-end, in YYYY-MM-DD format. + 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 (u) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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