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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2013
Pension and Other Postretirement Benefit Expense [Abstract]  
Employee Benefit Plans
. Employee Benefit Plans
 
The following table details the components of pension benefit costs (credits):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2013
 
2012
 
2013
 
2012
 
(In thousands)
Service cost
$
6,672

 
$
6,156

 
$
21,162

 
$
21,062

Interest cost
3,994

 
3,683

 
11,796

 
11,755

Curtailments
47

 
—

 
47

 
324

Expected return on plan assets
(5,848
)
 
(5,508
)
 
(17,690
)
 
(16,523
)
Amortization of prior service costs (credits)
(51
)
 
273

 
(152
)
 
200

Amortization of other actuarial losses
3,617

 
3,248

 
12,430

 
11,019

Net benefit cost
$
8,431

 
$
7,852

 
$
27,593

 
$
27,837


 
The following table details the components of other postretirement benefit costs (credits):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2013
 
2012
 
2013
 
2012
 
(In thousands)
Service cost
$
497

 
$
541

 
$
1,591

 
$
1,629

Interest cost
427

 
508

 
1,273

 
1,519

Curtailments
(5,444
)
 
(2,212
)
 
(5,444
)
 
(4,049
)
Amortization of prior service credits
(2,641
)
 
(2,837
)
 
(8,121
)
 
(8,708
)
Amortization of other actuarial losses (gains)
(55
)
 
(130
)
 
(53
)
 
(391
)
Net benefit credit
$
(7,216
)
 
$
(4,130
)
 
$
(10,754
)
 
$
(10,000
)

A curtailment was triggered in the third quarter of 2013 by reductions in employees' expected years of future service resulting primarily from the sale of Canyon Fuel.  Curtailments include the recognition of unamortized prior service costs and actuarial adjustments to the respective projected benefit obligations for the cash balance pension and medical plans and pneumoconiosis benefits.