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Pensions (Tables)
 6 Months Ended
Jun. 30, 2016
Pensions [Abstract]  
Components of Net Periodic Pension Cost
Components of Net Periodic Pension Cost

 
 
Three Months
Ended June 30
  
Six Months
Ended June 30
 
 
 
2016
  
2015
  
2016
  
2015
 
 
            
Service cost
 
$
255
  
$
292
  
$
509
  
$
583
 
Interest cost
  
400
   
379
   
800
   
758
 
Expected return on plan assets
  
(559
)
  
(558
)
  
(1,117
)
  
(1,115
)
Amortization of actuarial loss
  
140
   
176
   
280
   
352
 
Amortization of prior service cost
  
(3
)
  
(3
)
  
(6
)
  
(6
)
Rate-regulated adjustment
  
342
   
289
   
684
   
578
 
Net periodic pension expense
 
$
575
  
$
575
  
$
1,150
  
$
1,150