Quarterly report pursuant to Section 13 or 15(d)

EMPLOYEE BENEFIT PLANS (Details)

v3.8.0.1
EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Defined Benefit Pension Plan [Member]        
Components of Net Periodic Benefit Costs:        
Service Cost $ 1,688 $ 1,613 $ 5,064 $ 4,839
Interest Cost 1,437 1,397 4,312 4,191
Expected Return on Plan Assets (2,006) (1,934) (6,019) (5,802)
Prior Service Cost Amortization 56 69 167 207
Net Gain (Loss) Amortization 953 801 2,859 2,403
Net Periodic Benefit Cost (Income) $ 2,128 $ 1,946 $ 6,383 $ 5,838
Discount Rate (in percent) 4.21% 4.52% 4.21% 4.52%
Long-Term Rate of Return on Assets (in percent) 7.25% 7.50% 7.25% 7.50%
Supplemental Executive Retirement Plan [Member]        
Components of Net Periodic Benefit Costs:        
Interest Cost $ 48 $ 40 $ 143 $ 120
Prior Service Cost Amortization 0 0 0 0
Net Gain (Loss) Amortization 149 190 448 570
Net Periodic Benefit Cost (Income) $ 197 $ 230 $ 591 $ 690
Discount Rate (in percent) 3.92% 4.13% 3.92% 4.13%