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Pensions (Tables)
 3 Months Ended
Mar. 31, 2015
Pensions [Abstract]  
Components of Net Periodic Pension Cost
Components of Net Periodic Pension Cost

 
 
Three Months
Ended March 31
 
 
 
2015
  
2014
 
 
 
  
 
Service cost
 
$
291
  
$
238
 
Interest cost
  
379
   
361
 
Expected return on plan assets
  
(557
)
  
(497
)
Amortization of actuarial loss
  
176
   
31
 
Amortization of prior service cost
  
(3
)
  
(3
)
Rate-regulated adjustment
  
289
   
327
 
Net periodic pension expense
 
$
575
  
$
457