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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2014
Pension and Other Postretirement Benefit Expense [Abstract]  
Pension Benefit Costs
The following table details the components of pension benefit costs (credits):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
 
(In thousands)
Service cost
$
4,910

 
$
6,672

 
$
16,311

 
$
21,162

Interest cost
4,278

 
3,994

 
12,834

 
11,796

Expected return on plan assets
(5,929
)
 
(5,848
)
 
(17,786
)
 
(17,690
)
Curtailments
1,504

 
47

 
1,504

 
47

Amortization of prior service costs (credits)
(51
)
 
(51
)
 
(158
)
 
(152
)
Amortization of other actuarial losses
741

 
3,617

 
2,221

 
12,430

Net benefit cost
$
5,453

 
$
8,431

 
$
14,926

 
$
27,593

 
The following table details the components of other postretirement benefit costs (credits):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
 
(In thousands)
Service cost
$
383

 
$
497

 
$
1,267

 
$
1,591

Interest cost
460

 
427

 
1,381

 
1,273

Curtailments
—

 
(5,444
)
 
—

 
(5,444
)
Amortization of prior service credits
(2,500
)
 
(2,641
)
 
(7,502
)
 
(8,121
)
Amortization of other actuarial losses (gains)
(191
)
 
(55
)
 
(571
)
 
(53
)
Net benefit credit
$
(1,848
)
 
$
(7,216
)
 
$
(5,425
)
 
$
(10,754
)