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
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Pension Plan [Member]    
Components of Net Periodic Benefit Costs:    
Service Cost $ 1,721 $ 1,688
Interest Cost 1,415 1,437
Expected Return on Plan Assets (2,391) (2,006)
Prior Service Cost Amortization 50 56
Net Gain (Loss) Amortization 918 953
Net Periodic Benefit Cost (Income) $ 1,713 $ 2,128
Discount Rate (in percent) 3.71% 4.21%
Long-Term Rate of Return on Assets (in percent) 7.25% 7.25%
Supplemental Executive Retirement Plan [Member]    
Components of Net Periodic Benefit Costs:    
Interest Cost $ 57 $ 48
Net Gain (Loss) Amortization 406 149
Net Periodic Benefit Cost (Income) $ 463 $ 197
Discount Rate (in percent) 3.53% 3.92%