Quarterly report pursuant to Section 13 or 15(d)

EMPLOYEE BENEFIT PLANS (Components of the net periodic benefit cost) (Details)

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EMPLOYEE BENEFIT PLANS (Components of the net periodic benefit cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Defined Benefit Pension Plan [Member]        
Components of Net Periodic Benefit Costs:        
Service Cost $ 1,457 $ 1,529 $ 4,371 $ 4,587
Interest Cost 1,400 1,545 4,212 4,635
Expected Return on Plan Assets (2,748) (2,382) (8,245) (7,146)
Prior Service Cost Amortization 4 4 11 12
Net Loss Amortization 974 965 2,959 2,895
Special Termination Charge 0 0 61 0
Net Periodic Benefit Cost $ 1,087 $ 1,661 $ 3,369 $ 4,983
Discount Rate (in percent) 3.53% 4.43% 3.53% 4.43%
Long-Term Rate of Return on Assets (in percent) 7.00% 7.25% 7.00% 7.25%
Supplemental Executive Retirement Plan [Member]        
Components of Net Periodic Benefit Costs:        
Service Cost $ 10 $ 0 $ 21 $ 0
Interest Cost 83 87 238 261
Prior Service Cost Amortization 109 0 218 0
Net Loss Amortization 93 190 410 570
Net Periodic Benefit Cost $ 295 $ 277 $ 887 $ 831
Discount Rate (in percent) 3.16% 4.23% 3.16% 4.23%