XML 40 R29.htm IDEA: XBRL DOCUMENT v3.4.0.3
Employee Benefits (Tables)
3 Months Ended
Mar. 31, 2016
Employee Benefits [Abstract]  
Components of Net Periodic Benefit Cost for Postretirement Benefit Plans
The components of net periodic benefit cost for our postretirement benefit plans for the three months ended March 31, 2016 and 2015 were as follows (in thousands):

  
Three Months Ended
March 31,
 
Postretirement benefits
 
2016
  
2015
 
Service cost
 
$
  
$
 
Interest cost
  
3
   
7
 
Amortization of prior service cost
  
(13
)
  
(29
)
Actuarial net loss
  
275
   
434
 
Net periodic benefit cost
 
$
265
  
$
412