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Net Periodic Benefit Cost
 9 Months Ended
Sep. 30, 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 September 30:
 
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
$
273

 
$
141

 
$
3,752

 
$
4,008

 
$
—

 
$
—

 
4,025

 
4,149

Interest cost on projected benefit obligations
1,060

 
1,094

 
2,180

 
2,269

 
16

 
18

 
3,256

 
3,381

Expected return on plan assets
(1,733
)
 
(1,684
)
 
(7,733
)
 
(7,910
)
 
—

 
—

 
(9,466
)
 
(9,594
)
Recognition of prior service cost
—

 
—

 
(1,727
)
 
(1,611
)
 
(93
)
 
(195
)
 
(1,820
)
 
(1,806
)
Recognition of actuarial losses/(gains)
1,451

 
1,639

 
5,331

 
5,676

 
(311
)
 
(474
)
 
6,471

 
6,841

Net periodic pension cost/(credit)
$
1,051

 
$
1,190

 
$
1,803

 
$
2,432

 
$
(388
)
 
$
(651
)
 
$
2,466

 
$
2,971



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 nine months ended September 30:
 
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
$
817

 
$
423

 
$
11,416

 
$
12,086

 
$
—

 
$
—

 
12,233

 
12,509

Interest cost on projected benefit obligations
3,182

 
3,282

 
6,534

 
6,294

 
48

 
54

 
9,764

 
9,630

Expected return on plan assets
(5,197
)
 
(5,052
)
 
(23,408
)
 
(22,795
)
 
—

 
—

 
(28,605
)
 
(27,847
)
Recognition of prior service cost
—

 
—

 
(5,248
)
 
(4,439
)
 
(279
)
 
(585
)
 
(5,527
)
 
(5,024
)
Recognition of actuarial losses/(gains)
4,353

 
4,917

 
16,261

 
16,657

 
(937
)
 
(1,422
)
 
19,677

 
20,152

Net periodic pension cost/(credit)
$
3,155

 
$
3,570

 
$
5,555

 
$
7,803

 
$
(1,168
)
 
$
(1,953
)
 
$
7,542

 
$
9,420



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 plans during the year ended December 31, 2018. This estimate may change based upon several factors, including fluctuations in currency exchange rates, actual returns on plan assets and changes in legal requirements.