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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Funded status) (Details) - Nonunion Defined Benefit Pension Plan - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jan. 01, 2017
Change in benefit obligations          
Benefit obligations at beginning of period     $ 152,006    
Interest cost $ 1,073 $ 1,057 3,462 $ 3,520  
Actuarial loss     6,672    
Benefits paid     (23,325)    
Benefit obligations at end of period 138,815   138,815    
Change in plan assets          
Fair value of plan assets at beginning of period     144,805    
Actual return on plan assets     6,487    
Benefits paid     (23,325)    
Fair value of plan assets at end of period 127,967   127,967    
Funded status (10,848)   (10,848)    
Accumulated benefit obligation $ 138,815   $ 138,815    
Adjusted funding target attainment percentage         107.80%