XML 40 R28.htm IDEA: XBRL DOCUMENT v3.10.0.1
Pensions (Tables)
 9 Months Ended
Sep. 30, 2018
Pensions [Abstract]  
Components of Net Periodic Pension Cost
Components of Net Periodic Pension Cost

 
 
Three Months
Ended September 30
  
Nine Months
Ended September 30
 
 
 
2018
  
2017
  
2018
  
2017
 
 
            
Service cost
 
$
253
  
$
270
  
$
761
  
$
810
 
Interest cost
  
378
   
398
   
1,136
   
1,194
 
Expected return on plan assets
  
(698
)
  
(599
)
  
(2,094
)
  
(1,796
)
Amortization of actuarial loss
  
102
   
123
   
305
   
369
 
Amortization of prior service cost
  
(3
)
  
(3
)
  
(10
)
  
(9
)
Rate-regulated adjustment
  
543
   
386
   
1,627
   
1,157
 
Net periodic pension expense
 
$
575
  
$
575
  
$
1,725
  
$
1,725