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Accrued Workers' Compensation (Tables)
12 Months Ended
Dec. 31, 2012
Workers' Compensation Expense [Abstract]  
Schedule of Changes in Projected Benefit Obligations
The reconciliation of changes in the benefit obligation of the occupational disease liability is as follows:
 
December 31
 
2012
 
2011
 
(In thousands)
Beginning of year obligation
$
54,184

 
$
17,412

Service cost
1,993

 
2,059

Interest cost
2,400

 
1,799

Actuarial loss (gain)
(5,373
)
 
7,081

Benefit and administrative payments
(1,873
)
 
(1,097
)
Curtailments
7,100

 

Acquisition of ICG

 
26,930

Net obligation at end of year
$
58,431

 
$
54,184

Scheudle of Occupational Disease Obligation
The following table provides the assumptions used to determine the projected occupational disease obligation:
 
Year Ended December 31
 
2012
 
2011
 
2010
Weighted average assumptions:
 
 
 
 
 
Discount rate
4.54
%
 
5.10
%
 
5.96
%
Cost escalation rate
3.00
%
 
3.00
%
 
3.00
%
Schedule of Amounts Recognized in Balance Sheet
Summarized below is information about the amounts recognized in the accompanying consolidated balance sheets for workers' compensation benefits:
 
December 31
 
2012
 
2011
 
(In thousands)
Occupational disease costs
$
58,431

 
$
54,184

Traumatic and other workers' compensation claims
33,569

 
29,430

Total obligations
92,000

 
83,614

Less amount included in accrued expenses
10,371

 
11,666

Noncurrent obligations
$
81,629

 
$
71,948

Workers' Compensation Expense
 
 
Year Ended December 31
 
 
2012
 
2011
 
2010
 
 
(In thousands)
Self-insured occupational disease benefits:
 
 
 
 
 
 
Service cost
 
$
1,993

 
$
2,059

 
$
727

Interest cost
 
2,400

 
1,799

 
675

Net amortization
 
(453
)
 
(493
)
 
(1,860
)
Curtailments
 
3,022

 

 

Total occupational disease
 
6,962

 
3,365

 
(458
)
Traumatic injury claims and assessments
 
26,565

 
16,979

 
9,263

Total workers’ compensation expense
 
$
33,527

 
$
20,344

 
$
8,805