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Net Periodic Benefit Cost (Tables)
 3 Months Ended
Mar. 31, 2019
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
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Service cost, net
$
266

 
$
272

 
$
3,686

 
$
3,921

 
$
—

 
$
—

 
$
3,952

 
$
4,193

Interest cost on projected benefit obligations
1,146

 
1,061

 
2,558

 
2,223

 
16

 
16

 
3,720

 
3,300

Expected return on plan assets
(1,472
)
 
(1,732
)
 
(7,301
)
 
(7,987
)
 
—

 
—

 
(8,773
)
 
(9,719
)
Recognition of prior service cost
—

 
—

 
(1,702
)
 
(1,794
)
 
—

 
(93
)
 
(1,702
)
 
(1,887
)
Recognition of actuarial losses/(gains)
593

 
1,451

 
5,171

 
5,560

 
(173
)
 
(313
)
 
5,591

 
6,698

Net periodic pension cost/(credit)
$
533

 
$
1,052

 
$
2,412

 
$
1,923

 
$
(157
)
 
$
(390
)
 
$
2,788

 
$
2,585