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Retirement Benefit Plans (Tables)
6 Months Ended
Jun. 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 six months ended June 30, 2018 and 2017 were as follows:
 
 
Three Months Ended
 
 
June 30
 
 
Pension Benefits
 
Postretirement
 
 
U.S. Plans
 
Non-U.S. Plans
 
Medical Benefits
 
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
 
$

 
$

 
$
35

 
$
24

 
$
14

 
$
20

Interest cost
 
11

 
390

 
87

 
129

 
75

 
90

Expected return on plan assets
 

 
(586
)
 
(82
)
 
(101
)
 

 

Amortization of net actuarial loss
 
11

 
11

 

 

 

 

Amortization of prior service cost
 

 

 
32

 
49

 

 

Foreign currency
 

 

 
(23
)
 
234

 

 

Net periodic cost (credit)
 
22

 
(185
)
 
49

 
335

 
89

 
110

Settlement charge
 

 
205

 

 

 

 

Net benefit cost
 
$
22

 
$
20

 
$
49

 
$
335

 
$
89

 
$
110

 
 
Six Months Ended
 
 
June 30
 
 
Pension Benefits
 
Postretirement
 
 
U.S. Plans
 
Non-U.S. Plans
 
Medical Benefits
 
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
 
$

 
$

 
$
72

 
$
48

 
$
28

 
$
40

Interest cost
 
22

 
780

 
158

 
219

 
150

 
181

Expected return on plan assets
 

 
(1,171
)
 
(191
)
 
(197
)
 

 

Amortization of net actuarial loss
 
24

 
21

 

 

 

 

Amortization of prior service cost
 

 

 
106

 
96

 

 

Foreign currency
 

 

 
(94
)
 
229

 

 

Net periodic cost (credit)
 
46

 
(370
)
 
51

 
395

 
178

 
221

Settlement charge
 
50

 
205

 

 

 

 

Net benefit cost (credit)
 
$
96

 
$
(165
)
 
$
51

 
$
395

 
$
178

 
$
221