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Net Periodic Benefit Cost (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Net periodic benefit cost
Net periodic pension cost for the Company’s defined benefit pension plans and U.S. post-retirement medical plan includes the following components for the three months ended March 31:
 
U.S. Pension Benefits
 
Non-U.S. Pension Benefits
 
Other U.S. Post-retirement Benefits
 
Total
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost, net
$
272

 
$
141

 
$
3,921

 
$
3,988

 
$
—

 
$
—

 
$
4,193

 
$
4,129

Interest cost on projected benefit obligations
1,061

 
1,094

 
2,223

 
2,052

 
16

 
18

 
3,300

 
3,164

Expected return on plan assets
(1,732
)
 
(1,684
)
 
(7,987
)
 
(7,322
)
 
—

 
—

 
(9,719
)
 
(9,006
)
Recognition of prior service cost
—

 
—

 
(1,794
)
 
(1,879
)
 
(93
)
 
(195
)
 
(1,887
)
 
(2,074
)
Recognition of actuarial losses/(gains)
1,451

 
1,639

 
5,560

 
5,947

 
(313
)
 
(473
)
 
6,698

 
7,113

Net periodic pension cost/(credit)
$
1,052

 
$
1,190

 
$
1,923

 
$
2,786

 
$
(390
)
 
$
(650
)
 
$
2,585

 
$
3,326