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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income tax benefits reclassified from accumulated other comprehensive loss to income tax (expense) benefit        
Income tax benefit $ 1,600 $ 1,000 $ 2,700 $ 2,100
Retirement Benefits        
Components of net periodic benefit cost (income)        
Service cost 2,076 2,036 4,152 4,072
Interest cost 4,220 4,574 8,440 9,148
Expected return on plan assets (6,269) (6,232) (12,538) (12,464)
Amortization of prior service cost 28 28 56 56
Amortization of net loss 4,913 4,571 9,826 9,142
Net periodic benefit cost (income) 4,968 4,977 9,936 9,954
Other Postretirement Benefits Plan        
Components of net periodic benefit cost (income)        
Service cost 95 115 210 230
Interest cost 284 442 726 884
Expected return on plan assets 42 (722) (680) (1,444)
Amortization of prior service cost 0 0 0 0
Amortization of net loss 1,841 1 1,842 2
Net periodic benefit cost (income) $ 2,262 $ (164) $ 2,098 $ (328)