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PENSION AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details) - USD ($)
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Accumulated benefit obligation, defined benefit pension plans $ 165,700,000 $ 178,200,000
Weighted average duration of defined benefit obligation 30 years 11 months 23 days  
Actuarial loss expected to be recognized in net pension cost, remainder of 2018 $ 300,000  
Fixed income securities | Pooled separate accounts    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Target plan asset allocations 50.00%  
Fixed income securities | Common collective trusts funds    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Target plan asset allocations 30.00%  
Equity securities | Pooled separate accounts    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Target plan asset allocations 50.00%  
Equity securities | Common collective trusts funds    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Target plan asset allocations 70.00%  
Pension Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Expected contributions, remainder of 2018 (less than for other postretirement plans) $ 2,700,000  
Maximum | Other Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Impact of 0.25% change in discount rate on projected benefit obligation 1,000  
Expected contributions, remainder of 2018 (less than for other postretirement plans) $ 100,000