Quarterly report pursuant to Section 13 or 15(d)

EMPLOYEE BENEFIT PLANS (Details)

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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Defined Benefit Pension Plan [Member]        
Components of Net Periodic Benefit Costs:        
Service Cost $ 1,721 $ 1,688 $ 3,442 $ 3,376
Interest Cost 1,415 1,437 2,830 2,874
Expected Return on Plan Assets (2,391) (2,006) (4,782) (4,012)
Prior Service Cost Amortization 50 56 100 112
Net Gain (Loss) Amortization 918 953 1,837 1,906
Net Periodic Benefit Cost (Income) $ 1,713 $ 2,128 $ 3,427 $ 4,256
Discount Rate (in percent) 3.71% 4.21% 3.71% 4.21%
Long-Term Rate of Return on Assets (in percent) 7.25% 7.25% 7.25% 7.25%
Supplemental Executive Retirement Plan [Member]        
Components of Net Periodic Benefit Costs:        
Interest Cost $ 57 $ 48 $ 113 $ 96
Prior Service Cost Amortization 0 0 0 0
Net Gain (Loss) Amortization 406 149 813 298
Net Periodic Benefit Cost (Income) $ 463 $ 197 $ 926 $ 394
Discount Rate (in percent) 3.53% 3.92% 3.53% 3.92%