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Retirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Components of net benefit cost (credit)
The components of the net benefit cost for the three and nine months ended September 30, 2018 and 2017 were as follows:
 
 
Three Months Ended
 
 
September 30
 
 
Pension Benefits
 
Postretirement
 
 
U.S. Plans
 
Non-U.S. Plans
 
Medical Benefits
 
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
 
$
—

 
$
—

 
$
33

 
$
124

 
$
6

 
$
6

Interest cost
 
10

 
373

 
82

 
96

 
70

 
91

Expected return on plan assets
 
—

 
(581
)
 
(77
)
 
(101
)
 
—

 
—

Amortization of net actuarial loss
 
13

 
12

 
—

 
—

 
—

 
—

Amortization of prior service cost
 
—

 
—

 
54

 
50

 
—

 
—

Foreign currency
 
—

 
—

 
(118
)
 
135

 
—

 
—

Net periodic benefit cost (credit)
 
23

 
(196
)
 
(26
)
 
304

 
76

 
97

Net benefit cost (credit)
 
$
23

 
$
(196
)
 
$
(26
)
 
$
304

 
$
76

 
$
97

 
 
Nine Months Ended
 
 
September 30
 
 
Pension Benefits
 
Postretirement
 
 
U.S. Plans
 
Non-U.S. Plans
 
Medical Benefits
 
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
 
$
—

 
$
—

 
$
105

 
$
172

 
$
34

 
$
46

Interest cost
 
32

 
1,153

 
240

 
315

 
220

 
272

Expected return on plan assets
 
—

 
(1,752
)
 
(268
)
 
(298
)
 
—

 
—

Amortization of net actuarial loss
 
37

 
33

 
—

 
—

 
—

 
—

Amortization of prior service cost
 
—

 
—

 
160

 
146

 
—

 
—

Foreign currency
 
—

 
—

 
(212
)
 
364

 
—

 
—

Net periodic benefit cost (credit)
 
69

 
(566
)
 
25

 
699

 
254

 
318

Settlement charge
 
50

 
205

 
—

 
—

 
—

 
—

Net benefit cost (credit)
 
$
119

 
$
(361
)
 
$
25

 
$
699

 
$
254

 
$
318