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Retirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Components of the net benefit cost (credit)
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