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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Retirement Benefits        
Components of net periodic benefit cost        
Service cost $ 1,954 $ 1,832 $ 5,862 $ 5,496
Interest cost 5,126 4,408 15,378 13,224
Expected return on plan assets (5,892) (5,969) (17,676) (17,907)
Amortization of net loss 3,158 4,258 9,474 12,774
Net periodic benefit cost (income) 4,346 4,529 13,038 13,587
Other Postretirement Benefits Plan        
Components of net periodic benefit cost        
Service cost 117 211 351 633
Interest cost 509 527 1,527 1,581
Expected return on plan assets (570) (672) (1,710) (2,016)
Amortization of prior service credit (57) (415) (171) (1,245)
Amortization of net loss 74 334 222 1,002
Net periodic benefit cost (income) $ 73 $ (15) $ 219 $ (45)