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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income tax benefits reclassified from accumulated other comprehensive loss to income tax (expense) benefit    
Income tax benefit $ 1,100 $ 700
Retirement Benefits    
Components of net periodic benefit cost    
Service cost 2,036 1,954
Interest cost 4,574 5,126
Expected return on plan assets (6,232) (5,892)
Amortization of net loss 4,571 3,158
Amortization of prior service cost (credit) (a) 28 0
Net periodic benefit cost (income) 4,977 4,346
Other Postretirement Benefits Plan    
Components of net periodic benefit cost    
Service cost 115 117
Interest cost 442 509
Expected return on plan assets (722) (570)
Amortization of net loss 1 74
Amortization of prior service cost (credit) (a) 0 (57)
Net periodic benefit cost (income) $ (164) $ 73