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Retirement Benefit Plans
 3 Months Ended
Mar. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Retirement Benefit Plans
12.
Retirement Benefit Plans
Our defined benefit pension plans and postretirement medical plan are described in Note 13 of our annual report on Form 10-K for the year ended December 31, 2017. We have contributed $114 and $269 during the first quarter of 2018 to our pension plans and postretirement medical plan, respectively.
The components of the net periodic (benefit) cost for the three months ended March 31, 2018 and 2017 were as follows:
 
 
Three Months Ended
 
 
March 31
 
 
Pension Benefits
 
Postretirement
 
 
U.S. Plans
 
Non-U.S. Plans
 
Medical Benefits
 
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
 
$
—

 
$
—

 
$
37

 
$
24

 
$
14

 
$
20

Interest cost
 
11

 
390

 
71

 
90

 
75

 
91

Expected return on plan assets
 
—

 
(585
)
 
(109
)
 
(96
)
 
—

 
—

Amortization of net actuarial loss
 
13

 
10

 
—

 
—

 
—

 
—

Amortization of prior service cost
 
—

 
—

 
74

 
47

 
—

 
—

Foreign currency
 
—

 
—

 
(71
)
 
(5
)
 
—

 
—

Net periodic cost (benefit)
 
24

 
(185
)
 
2

 
60

 
89

 
111

Settlement charge
 
50

 
—

 
—

 
—

 
—

 
—

Net benefit cost (credit)
 
$
74

 
$
(185
)
 
$
2

 
$
60

 
$
89

 
$
111