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Employee Benefits (Tables)
3 Months Ended
Mar. 31, 2015
Employee Benefits [Abstract]  
Components of Net Periodic Benefit Cost (Credit) for our Defined Benefit Plans and Postretirement Benefit Plans
The components of net periodic benefit cost (credit) for our defined benefit plans and postretirement benefit plans for the three months ended March 31, 2015 and 2014 were as follows (in thousands):

  
Three Months Ended
 
  
March 31,
 
Pension benefits
 
2015
  
2014
 
Service cost                                                                                              
 
$
  
$
41
 
Interest cost                                                                                              
  
54
   
65
 
Amortization of prior service cost                                                                                              
  
   
 
Actuarial net loss                                                                                              
  
184
   
57
 
Net periodic benefit cost                                                                                                  
 
$
238
  
$
163
 
         
Postretirement benefits
        
Service cost                                                                                              
 
$
  
$
 
Interest cost                                                                                              
  
7
   
8
 
Amortization of prior service cost                                                                                              
  
(29
)
  
(754
)
Actuarial net loss                                                                                              
  
434
   
535
 
Net periodic benefit cost (credit)                                                                                                  
 
$
412
  
$
(211
)