XML 61 R51.htm IDEA: XBRL DOCUMENT v3.20.2
PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Components of cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Components of net periodic benefit cost        
Pension settlement expense     $ 89 $ 8,135
Nonunion Defined Benefit Pension Plan        
Components of net periodic benefit cost        
Interest cost   $ 138   624
Expected return on plan assets   29   (60)
Pension settlement expense   2,530   4,164
Amortization of net actuarial (gain) loss   50   260
Net periodic benefit cost   2,747   4,988
Noncash charge to pension settlement expense   4,000   4,000
Supplemental Benefit Plan        
Components of net periodic benefit cost        
Interest cost $ 2 9 7 29
Pension settlement expense     89  
Amortization of net actuarial (gain) loss 2 24 7 71
Net periodic benefit cost 4 33 103 100
Postretirement Health Benefit Plan        
Components of net periodic benefit cost        
Service cost 46 80 140 240
Interest cost 144 303 432 909
Amortization of prior service credit   (8)   (25)
Amortization of net actuarial (gain) loss (150) 225 (448) 674
Net periodic benefit cost $ 40 $ 600 $ 124 $ 1,798