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Workers Compensation Expense (Tables)
6 Months Ended
Jun. 30, 2019
Compensation Related Costs [Abstract]  
Workers' compensation expense
Workers’ compensation expense consists of the following components:
 
         Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
 
(In thousands)
Self-insured occupational disease benefits:
 
 
 
 
 
 
 
Service cost
$
1,669

 
$
1,860

 
$
3,338

 
$
3,720

Interest cost(1)
1,354

 
1,194

 
2,708

 
2,389

Total occupational disease
$
3,023

 
$
3,054

 
$
6,046

 
$
6,109

Traumatic injury claims and assessments
2,410

 
2,188

 
4,554

 
5,199

Total workers’ compensation expense
$
5,433

 
$
5,242

 
$
10,600

 
$
11,308


(1) In accordance with the adoption of ASU 2017-07, “Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost,” these costs are recorded within Nonoperating expenses in the Condensed Consolidated Income Statements on the line item “Non-service related pension and postretirement benefit costs.”