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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income taxes reclassified from accumulated other comprehensive loss to income tax (expense) benefit        
Income tax benefit $ 1,300 $ 1,100 $ 4,000 $ 3,200
Retirement Benefits        
Components of net periodic benefit cost (income)        
Service cost 2,076 2,036 6,228 6,108
Interest cost 4,220 4,574 12,660 13,722
Expected return on plan assets (6,269) (6,232) (18,807) (18,696)
Amortization of prior service cost 28 28 84 84
Amortization of net loss 4,913 4,571 14,739 13,713
Net periodic benefit cost (income) 4,968 4,977 14,904 14,931
Other Postretirement Benefits Plan        
Components of net periodic benefit cost (income)        
Service cost 105 115 315 345
Interest cost 363 442 1,089 1,326
Expected return on plan assets (340) (722) (1,020) (2,166)
Amortization of prior service cost 0 0 0 0
Amortization of net loss 921 1 2,763 3
Net periodic benefit cost (income) $ 1,049 $ (164) $ 3,147 $ (492)