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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Retirement Benefits        
Components of net periodic benefit cost        
Service cost $ 1,954 $ 1,832 $ 3,908 $ 3,664
Interest cost 5,126 4,408 10,252 8,816
Expected return on plan assets (5,892) (5,969) (11,784) (11,938)
Amortization of net loss 3,158 4,258 6,316 8,516
Net periodic benefit cost (income) 4,346 4,529 8,692 9,058
Other Postretirement Benefits Plan [Member]        
Components of net periodic benefit cost        
Service cost 117 211 234 422
Interest cost 509 527 1,018 1,054
Expected return on plan assets (570) (672) (1,140) (1,344)
Amortization of prior service credit (57) (415) (114) (830)
Amortization of net loss 74 334 148 668
Net periodic benefit cost (income) $ 73 $ (15) $ 146 $ (30)