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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost
A summary of the components of net periodic benefit cost for Mattel’s defined benefit pension plans is as follows:
 
For the Three Months Ended
 
For the Nine Months Ended
 
September 30,
2018
 
September 30,
2017
 
September 30,
2018
 
September 30,
2017
 
(In thousands)
Service cost
$
1,014

 
$
1,198

 
$
3,206

 
$
3,441

Interest cost
4,494

 
4,479

 
13,691

 
13,370

Expected return on plan assets
(5,621
)
 
(5,768
)
 
(16,952
)
 
(17,253
)
Amortization of prior service cost
7

 
8

 
23

 
23

Recognized actuarial loss
2,125

 
1,823

 
6,648

 
5,464

Settlement loss
—

 
—

 
2,443

 
—


$
2,019

 
$
1,740

 
$
9,059

 
$
5,045


A summary of the components of net periodic benefit cost for Mattel's postretirement benefit plans is as follows:
 
For the Three Months Ended
 
For the Nine Months Ended
 
September 30,
2018
 
September 30,
2017
 
September 30,
2018
 
September 30,
2017
 
(In thousands)
Service credit
$
—

 
$
—

 
$
1

 
$
1

Interest cost
52

 
203

 
156

 
609

Amortization of prior service credit
(509
)
 
—

 
(1,528
)
 
—

Recognized actuarial (gain) loss
(80
)
 
37

 
(240
)
 
112


$
(537
)
 
$
240

 
$
(1,611
)
 
$
722