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Net Periodic Benefit Cost (Tables)
 3 Months Ended
Mar. 31, 2020
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
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
Service cost, net
$
326

 
$
266

 
$
4,517

 
$
3,686

 
$
—

 
$
—

 
$
4,843

 
$
3,952

Interest cost on projected benefit obligations
889

 
1,146

 
1,180

 
2,558

 
6

 
16

 
2,075

 
3,720

Expected return on plan assets
(1,524
)
 
(1,472
)
 
(8,085
)
 
(7,301
)
 
—

 
—

 
(9,609
)
 
(8,773
)
Recognition of prior service cost
—

 
—

 
(1,725
)
 
(1,702
)
 
—

 
—

 
(1,725
)
 
(1,702
)
Recognition of actuarial losses/(gains)
644

 
593

 
5,654

 
5,171

 
(26
)
 
(173
)
 
6,272

 
5,591

Net periodic pension cost/(credit)
$
335

 
$
533

 
$
1,541

 
$
2,412

 
$
(20
)
 
$
(157
)
 
$
1,856

 
$
2,788