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Retirement Plans and Other Retiree Benefits
 3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [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, 2016 and 2015 were as follows:
 
Pension Benefits
 
Other Retiree Benefits
 
United States
 
International
 
 
 
 
 
Three Months Ended March 31,
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost
$
—

 
$
—

 
$
4

 
$
5

 
$
3

 
$
4

Interest cost
27

 
25

 
6

 
8

 
11

 
11

ESOP offset
—

 
—

 
—

 
—

 
—

 
—

Expected return on plan assets
(27
)
 
(29
)
 
(5
)
 
(8
)
 
—

 
(1
)
Amortization of transition and prior service costs (credits)
—

 
—

 
—

 
—

 
—

 
—

Amortization of actuarial loss (gain)
10

 
12

 
2

 
3

 
4

 
7

Net periodic benefit cost
$
10

 
$
8

 
$
7

 
$
8

 
$
18

 
$
21


For the three months ended March 31, 2016, the Company made voluntary contributions of $50 to its U.S. postretirement plans. For the three months ended March 31, 2015, the Company did not make any voluntary contributions to its U.S. postretirement plans.