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Pensions (Tables)
 6 Months Ended
Jun. 30, 2015
Pensions [Abstract]  
Components of Net Periodic Pension Cost
Components of Net Periodic Pension Cost
 
  
Three Months Ended
June 30
  
Six Months Ended
June 30
 
  
2015
  
2014
  
2015
  
2014
 
         
Service cost
 
$
292
  
$
238
  
$
583
  
$
476
 
Interest cost
  
379
   
361
   
758
   
722
 
Expected return on plan assets
  
(558
)
  
(497
)
  
(1,115
)
  
(994
)
Amortization of actuarial loss
  
176
   
32
   
352
   
63
 
Amortization of prior service cost
  
(3
)
  
(3
)
  
(6
)
  
(6
)
Rate-regulated adjustment
  
289
   
444
   
578
   
771
 
Net periodic pension expense
 
$
575
  
$
575
  
$
1,150
  
$
1,032