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EMPLOYEE BENEFIT PLANS Table 2 (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Pension Plans (The Pension Plan and Excess Pension Plan)        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1,926 $ 1,919 $ 5,778 $ 5,757
Interest cost 1,006 1,097 3,018 3,291
Expected return on assets (1,353) (1,254) (4,056) (3,762)
Amortization of prior service credit (516) (516) (1,549) (1,547)
Amortization of net loss 273 461 819 1,383
Net periodic benefit cost (income) 1,336 1,707 4,010 5,122
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 105 118 315 354
Interest cost 100 111 300 334
Expected return on assets 0 0 0 0
Amortization of prior service credit (286) (285) (858) (857)
Amortization of net loss 45 67 135 201
Net periodic benefit cost (income) $ (36) $ 11 $ (108) $ 32