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Retirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Components of the net periodic cost (benefit)
The components of the net periodic (benefit) cost for the three and nine months ended September 30, 2017 and 2016 were as follows:
 
 
Three Months Ended
 
 
September 30
 
 
Pension Benefits
 
Postretirement
 
 
U.S. Plans
 
Non-U.S. Plans
 
Medical Benefits
 
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
—

 
$
88

 
$
124

 
$
32

 
$
6

 
$
25

Interest cost
 
373

 
414

 
96

 
96

 
91

 
99

Expected return on plan assets
 
(581
)
 
(599
)
 
(101
)
 
(89
)
 
—

 
—

Amortization of net actuarial loss
 
12

 
13

 
—

 
—

 
—

 
—

Amortization of prior service cost
 
—

 
10

 
50

 
29

 
—

 
—

Foreign currency
 
—

 
—

 
135

 
(57
)
 
—

 
—

Net periodic (benefit) cost
 
$
(196
)
 
$
(74
)
 
$
304

 
$
11

 
$
97

 
$
124

 
 
Nine Months Ended
 
 
September 30
 
 
Pension Benefits
 
Postretirement
 
 
U.S. Plans
 
Non-U.S. Plans
 
Medical Benefits
 
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
—

 
$
265

 
$
172

 
$
104

 
$
46

 
$
73

Interest cost
 
1,153

 
1,244

 
315

 
304

 
272

 
298

Expected return on plan assets
 
(1,752
)
 
(1,799
)
 
(298
)
 
(283
)
 
—

 
—

Amortization of net actuarial loss
 
33

 
30

 
—

 
—

 
—

 
—

Amortization of prior service cost
 
—

 
31

 
146

 
93

 
—

 
—

Settlement charge
 
205

 
—

 
—

 
—

 
—

 
—

Foreign currency
 
—

 
—

 
364

 
(33
)
 
—

 
—

Net periodic (benefit) cost
 
$
(361
)
 
$
(229
)
 
$
699

 
$
185

 
$
318

 
$
371