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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2018
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, 2018 and 2017 were as follows (in thousands):
 
  
Three Months Ended
March 31,
 
Postretirement benefits
 
2018
  
2017 (1)
 
Service cost
 
$
—
  
$
—
 
Interest cost
  
2
   
2
 
Amortization of prior service cost
  
—
   
—
 
Actuarial net (gain) loss
  
(9
)
  
(59
)
Net periodic benefit cost (credit)
 
$
(7
)
 
$
(57
)

(1)
Net periodic benefit cost (credit) has been reclassified from selling, general and administrative expenses to other non-operating income (expense), net on our consolidated statement of operations upon adoption of ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, see Note 2, “Summary of Significant Accounting Policies” for additional information.