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Pension Plans
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Pension Plans
Pension Plans

Foreign Defined Benefit Pension Plans

Our subsidiaries in Japan, Korea, Malaysia, the Philippines and Taiwan sponsor defined benefit pension plans. Charges to expense are based upon actuarial analyses. The components of net periodic pension cost for these defined benefit pension plans are as follows:
 
For the Three Months Ended
June 30,
 
For the Six Months Ended
June 30,
 
2017
 
2016
 
2017
 
2016
 
(In thousands)
Service cost
$
8,430

 
$
8,490

 
$
16,770

 
$
16,660

Interest cost
1,013

 
924

 
2,020

 
1,828

Expected return on plan assets
(1,133
)
 
(956
)
 
(2,261
)
 
(1,903
)
Amortization of prior service cost
—

 
8

 
31

 
17

Recognized actuarial loss
22

 
23

 
44

 
47

Net periodic pension cost
$
8,332

 
$
8,489

 
$
16,604

 
$
16,649



Defined Contribution Pension Plans

We sponsor defined contribution pension plans in Korea, Malaysia, Taiwan and the U.S. The following table summarizes our defined contribution expense:
 
For the Three Months Ended
June 30,
 
For the Six Months Ended
June 30,
 
2017
 
2016
 
2017
 
2016
 
(In thousands)
Defined contribution expense
$
2,581

 
$
2,231

 
$
5,779

 
$
5,166