XML 60 R49.htm IDEA: XBRL DOCUMENT v3.19.2
RETIREMENT PLANS - Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Components of the plan's net periodic pension cost        
Company contributions     $ 0 $ 0
Pension Plans        
Components of the plan's net periodic pension cost        
Service cost $ 447 $ 448 895 897
Interest cost 841 819 1,682 1,639
Expected return on plan assets (1,263) (1,208) (2,527) (2,418)
Actuarial gain/ loss 7 30 15 61
Net periodic pension cost 32 89 65 179
Postretirement Benefits        
Components of the plan's net periodic pension cost        
Service cost 37 37 74 74
Interest cost 40 40 80 80
Actuarial gain/ loss (17) (17) (34) (34)
Net periodic pension cost $ 60 $ 60 $ 120 $ 120