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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
 
2014
 
2013
 
2014
 
2013
 
(In thousands)
Service cost
$
5,477

 
$
6,790

 
$
11,401

 
$
14,490

Interest cost
4,192

 
3,876

 
8,556

 
7,802

Expected return on plan assets
(5,879
)
 
(6,036
)
 
(11,857
)
 
(11,842
)
Amortization of prior service costs (credits)
(53
)
 
57

 
(107
)
 
(101
)
Amortization of other actuarial losses
532

 
4,264

 
1,480

 
8,815

Net benefit cost
$
4,269

 
$
8,951

 
$
9,473

 
$
19,164

 
The following table details the components of other postretirement benefit costs (credits):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2014
 
2013
 
2014
 
2013
 
(In thousands)
Service cost
$
440

 
$
538

 
$
884

 
$
1,094

Interest cost
457

 
415

 
921

 
846

Amortization of prior service credits
(2,501
)
 
(2,730
)
 
(5,002
)
 
(5,480
)
Amortization of other actuarial losses (gains)
(210
)
 
(75
)
 
(380
)
 
2

Net benefit credit
$
(1,814
)
 
$
(1,852
)
 
$
(3,577
)
 
$
(3,538
)