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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2012
Pension and Other Postretirement Benefit Expense [Abstract]  
Pension Benefit Costs
The following table details the components of pension benefit costs:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2012
 
2011
 
2012
 
2011
 
 
(In thousands)
Service cost
 
$
6,156

 
$
4,122

 
$
21,062

 
$
12,367

Interest cost
 
3,683

 
4,063

 
11,755

 
12,190

Curtailments
 
—

 
—

 
324

 
—

Expected return on plan assets
 
(5,508
)
 
(5,453
)
 
(16,523
)
 
(16,359
)
Amortization of prior service cost (credit)
 
273

 
(47
)
 
200

 
(142
)
Amortization of other actuarial losses
 
3,248

 
2,187

 
11,019

 
6,561

Net benefit cost
 
$
7,852

 
$
4,872

 
$
27,837

 
$
14,617
Other Postretirement Benefit Costs
The following table details the components of other postretirement benefit costs (credits):
 
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2012
 
2011
 
2012
 
2011
 
 
(In thousands)
Service cost
 
$
541

 
$
1,493

 
$
1,629

 
$
2,416

Interest cost
 
508

 
1,125

 
1,519

 
2,152

Curtailments
 
(2,212
)
 
—

 
(4,049
)
 
—

Amortization of prior service cost credits
 
(2,837
)
 
(636
)
 
(8,708
)
 
(1,773
)
Amortization of other actuarial gains
 
(130
)
 
(775
)
 
(391
)
 
(2,325
)
Net benefit cost (credit)
 
$
(4,130
)
 
$
1,207

 
$
(10,000
)
 
$
470