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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2021
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
 March 31,
2021
March 31,
2020
 (In thousands)
Service cost$1,293 $1,109 
Interest cost2,540 3,781 
Expected return on plan assets(4,627)(4,921)
Amortization of prior service cost111 43 
Recognized actuarial loss2,785 2,359 
$2,102 $2,371 
A summary of the components of net periodic benefit cost for Mattel's postretirement benefit plans is as follows:
 For the Three Months Ended
 March 31,
2021
March 31,
2020
 (In thousands)
Interest cost$19 $35 
Amortization of prior service credit(509)(509)
Recognized actuarial gain(2)(19)
$(492)$(493)