Retirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2015
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 months ended March 31, 2015 and 2014 were as follows:
 
 
Three Months Ended
 
 
March 31
 
 
Pension Benefits
 
Postretirement
 
 
U.S. Plans
 
Non-U.S. Plans
 
Medical Benefits
 
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost
 
$
106

 
$
124

 
$
36

 
$
38

 
$
31

 
$
32

Interest cost
 
432

 
494

 
123

 
132

 
109

 
131

Expected return on plan assets
 
(652
)
 
(670
)
 
(144
)
 
(129
)
 
—

 
—

Amortization of net actuarial loss
 
226

 
44

 
—

 
—

 
35

 
11

Amortization of prior service cost (benefit)
 
11

 
11

 
65

 
46

 
—

 
(2
)
Foreign currency
 
—

 
—

 
(83
)
 
18

 
—

 
—

Net periodic cost (benefit)
 
$
123

 
$
3

 
$
(3
)
 
$
105

 
$
175

 
$
172