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Retirement Plans and Other Retiree Benefits
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Retirement Plans and Other Retiree Benefits
Retirement Plans and Other Retiree Benefits

Components of Net periodic benefit cost for the three months ended March 31, 2019 and 2018 were as follows:

 
Pension Benefits
 
Other Retiree Benefits
 
United States
 
International
 
 
 
 
 
Three Months Ended March 31,
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Service cost
$
—

 
$
—

 
$
4

 
$
4

 
$
4

 
$
4

Interest cost
23

 
21

 
5

 
6

 
11

 
10

Expected return on plan assets
(26
)
 
(29
)
 
(5
)
 
(6
)
 
(1
)
 
—

Amortization of actuarial loss (gain)
13

 
12

 
2

 
2

 
2

 
4

Net periodic benefit cost
$
10

 
$
4

 
$
6

 
$
6

 
$
16

 
$
18



For the three months ended March 31, 2019 and 2018, the Company made voluntary contributions to its U.S. postretirement plans of $102 and $0, respectively.