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EMPLOYEE BENEFIT PLANS Table 2 (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Pension Plans (The Pension Plan and Excess Pension Plan)        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1,926 $ 1,919 $ 3,852 $ 3,838
Interest cost 1,006 1,097 2,012 2,194
Expected return on assets (1,351) (1,254) (2,703) (2,508)
Amortization of prior service credit (516) (515) (1,033) (1,031)
Amortization of net loss 273 461 546 922
Net periodic benefit cost (income) 1,338 1,708 2,674 3,415
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 105 118 210 236
Interest cost 100 111 200 223
Expected return on assets 0 0 0 0
Amortization of prior service credit (286) (286) (572) (572)
Amortization of net loss 45 67 90 134
Net periodic benefit cost (income) $ (36) $ 10 $ (72) $ 21