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Retirement Plans and Other Retiree Benefits
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Retirement Plans and Other Retiree Benefits
Retirement Plans and Other Retiree Benefits

Components of Net periodic benefit cost for the three and nine months ended September 30, 2017 and 2016 were as follows:
 
Pension Benefits
 
Other Retiree Benefits
 
United States
 
International
 
 
 
 
 
Three Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost
$
—

 
$
—

 
$
4

 
$
4

 
$
3

 
$
4

Interest cost
23

 
27

 
6

 
7

 
9

 
10

ESOP offset
—

 
—

 
—

 
—

 
(1
)
 
—

Expected return on plan assets
(28
)
 
(27
)
 
(5
)
 
(6
)
 
—

 
—

Amortization of transition and prior service costs (credits)
—

 
—

 
—

 
—

 
—

 
—

Amortization of actuarial loss (gain)
12

 
10

 
2

 
2

 
1

 
3

Net periodic benefit cost
$
7

 
$
10

 
$
7

 
$
7

 
$
12

 
$
17


 
Pension Benefits
 
Other Retiree Benefits
 
United States
 
International
 
 
 
 
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost
$
1

 
$
1

 
$
11

 
$
12

 
$
11

 
$
10

Interest cost
70

 
80

 
16

 
19

 
30

 
32

ESOP offset
—

 
—

 
—

 
—

 
(1
)
 
(1
)
Expected return on plan assets
(83
)
 
(82
)
 
(15
)
 
(17
)
 
—

 
—

Amortization of transition and prior service costs (credits)
—

 
—

 
—

 
—

 
—

 
—

Amortization of actuarial loss (gain)
36

 
30

 
7

 
6

 
9

 
11

Net periodic benefit cost
$
24

 
$
29

 
$
19

 
$
20

 
$
49

 
$
52

 

For the nine months ended September 30, 2017 and 2016, the Company made voluntary contributions to its U.S. postretirement plans of $81 and $53, respectively.