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Net Periodic Benefit Cost
 9 Months Ended
Sep. 30, 2019
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
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Service cost, net
$
266

 
$
273

 
$
3,788

 
$
3,752

 
$
—

 
$
—

 
4,054

 
4,025

Interest cost on projected benefit obligations
1,146

 
1,060

 
2,547

 
2,180

 
16

 
16

 
3,709

 
3,256

Expected return on plan assets
(1,472
)
 
(1,733
)
 
(7,342
)
 
(7,733
)
 
—

 
—

 
(8,814
)
 
(9,466
)
Recognition of prior service cost
—

 
—

 
(1,679
)
 
(1,727
)
 
—

 
(93
)
 
(1,679
)
 
(1,820
)
Recognition of actuarial losses/(gains)
593

 
1,451

 
5,149

 
5,331

 
(173
)
 
(311
)
 
5,569

 
6,471

Net periodic pension cost/(credit)
$
533

 
$
1,051

 
$
2,463

 
$
1,803

 
$
(157
)
 
$
(388
)
 
$
2,839

 
$
2,466



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
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Service cost, net
$
797

 
$
817

 
$
11,290

 
$
11,416

 
$
—

 
$
—

 
12,087

 
12,233

Interest cost on projected benefit obligations
3,438

 
3,182

 
7,595

 
6,534

 
48

 
48

 
11,081

 
9,764

Expected return on plan assets
(4,415
)
 
(5,197
)
 
(21,846
)
 
(23,408
)
 
—

 
—

 
(26,261
)
 
(28,605
)
Recognition of prior service cost
—

 
—

 
(5,033
)
 
(5,248
)
 
—

 
(279
)
 
(5,033
)
 
(5,527
)
Recognition of actuarial losses/(gains)
1,780

 
4,353

 
15,410

 
16,261

 
(518
)
 
(937
)
 
16,672

 
19,677

Net periodic pension cost/(credit)
$
1,600

 
$
3,155

 
$
7,416

 
$
5,555

 
$
(470
)
 
$
(1,168
)
 
$
8,546

 
$
7,542



As previously disclosed in the Company's Annual Report on Form 10-K for the year ended December 31, 2018, the Company expects to make employer contributions of approximately $25.3 million to its non-U.S. pension plans during the year ended December 31, 2019. This estimate may change based upon several factors, including fluctuations in currency exchange rates, actual returns on plan assets and changes in legal requirements.