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Workers' Compensation Expense
 9 Months Ended
Sep. 30, 2012
Workers' Compensation Expense [Abstract]  
Workers' Compensation Expense
Workers’ Compensation Expense
 
The following table details the components of workers’ compensation expense:
 
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2012
 
2011
 
2012
 
2011
 
 
(In thousands)
Service cost
 
$
419

 
$
807

 
$
1,458

 
$
1,246

Interest cost
 
629

 
619

 
1,708

 
1,177

Net amortization
 
—

 
(109
)
 
(574
)
 
(370
)
Curtailments
 
—

 
—

 
1,933

 
—

Total occupational disease
 
1,048

 
1,317

 
4,525

 
2,053

Traumatic injury claims and assessments
 
7,453

 
5,207

 
19,052

 
10,856

Total workers’ compensation expense
 
$
8,501

 
$
6,524

 
$
23,577

 
$
12,909