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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income tax benefits reclassified from accumulated other comprehensive loss to income tax expense        
Income tax benefit $ 1,100 $ 700 $ 3,200 $ 2,200
Other Postretirement Benefits Plan        
Components of net periodic benefit cost (income)        
Service cost 115 117 345 351
Interest cost 442 509 1,326 1,527
Expected return on plan assets (722) (570) (2,166) (1,710)
Amortization of prior service cost (credit) 0 (57) 0 (171)
Amortization of net loss 1 74 3 222
Net periodic benefit cost (income) (164) 73 (492) 219
Retirement Benefits        
Components of net periodic benefit cost (income)        
Service cost 2,036 1,954 6,108 5,862
Interest cost 4,574 5,126 13,722 15,378
Expected return on plan assets (6,232) (5,892) (18,696) (17,676)
Amortization of prior service cost (credit) 28 0 84 0
Amortization of net loss 4,571 3,158 13,713 9,474
Net periodic benefit cost (income) $ 4,977 $ 4,346 $ 14,931 $ 13,038