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Retirement Benefit Plans (Tables)
 6 Months Ended
Jun. 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 cost (benefit) for the three and six months ended June 30, 2017 and 2016 were as follows:
 
 
Three Months Ended
 
 
June 30
 
 
Pension Benefits
 
Postretirement
 
 
U.S. Plans
 
Non-U.S. Plans
 
Medical Benefits
 
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
—

 
$
97

 
$
24

 
$
36

 
$
20

 
$
24

Interest cost
 
390

 
415

 
129

 
103

 
90

 
100

Expected return on plan assets
 
(586
)
 
(603
)
 
(101
)
 
(97
)
 
—

 
—

Amortization of net actuarial loss
 
11

 
8

 
—

 
—

 
—

 
—

Amortization of prior service cost
 
—

 
10

 
49

 
32

 
—

 
—

Settlement charge
 
205

 
—

 
—

 
—

 
—

 
—

Foreign currency
 
—

 
—

 
234

 
(16
)
 
—

 
—

Net periodic cost (benefit)
 
$
20

 
$
(73
)
 
$
335

 
$
58

 
$
110

 
$
124

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

 
$
177

 
$
48

 
$
72

 
$
40

 
$
48

Interest cost
 
780

 
830

 
219

 
208

 
181

 
199

Expected return on plan assets
 
(1,171
)
 
(1,200
)
 
(197
)
 
(194
)
 
—

 
—

Amortization of net actuarial loss
 
21

 
17

 
—

 
—

 
—

 
—

Amortization of prior service cost
 
—

 
21

 
96

 
64

 
—

 
—

Settlement charge
 
205

 
—

 
—

 
—

 
—

 
—

Foreign currency
 
—

 
—

 
229

 
24

 
—

 
—

Net periodic (benefit) cost
 
$
(165
)
 
$
(155
)
 
$
395

 
$
174

 
$
221

 
$
247