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Net Periodic Benefit Cost
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
NET PERIODIC BENEFIT COST
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



As previously disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017, the Company expects to make employer contributions of approximately $25.9 million to its non-U.S. pension plan and employer contributions of approximately $0.4 million to its U.S. post-retirement medical plan during the year ended December 31, 2018. These estimates may change based upon several factors, including fluctuations in currency exchange rates, actual returns on plan assets and changes in legal requirements.