XML 68 R54.htm IDEA: XBRL DOCUMENT v3.19.1
PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Components of cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Components of net periodic benefit cost    
Pension settlement expense $ 1,356 $ 654
Nonunion Defined Benefit Pension Plan    
Components of net periodic benefit cost    
Interest cost 318 1,015
Expected return on plan assets (90) (401)
Pension settlement expense 1,356 654
Amortization of net actuarial loss 149 778
Net periodic benefit cost 1,733 2,046
Supplemental Benefit Plan    
Components of net periodic benefit cost    
Interest cost 10 27
Amortization of net actuarial loss 24 20
Net periodic benefit cost 34 47
Postretirement Health Benefit Plan    
Components of net periodic benefit cost    
Service cost 80 92
Interest cost 303 209
Amortization of prior service credit (9) (23)
Amortization of net actuarial loss 225 76
Net periodic benefit cost $ 599 $ 354