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Net Periodic Benefit Cost
 6 Months Ended
Jun. 30, 2020
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 June 30:
 
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

 
$
4,528

 
$
3,799

 
$
—

 
$
—

 
4,854

 
4,065

Interest cost on projected benefit obligations
889

 
1,146

 
1,097

 
2,520

 
7

 
16

 
1,993

 
3,682

Expected return on plan assets
(1,524
)
 
(1,472
)
 
(8,017
)
 
(7,218
)
 
—

 
—

 
(9,541
)
 
(8,690
)
Recognition of prior service cost
—

 
—

 
(1,735
)
 
(1,637
)
 
(19
)
 
—

 
(1,754
)
 
(1,637
)
Recognition of actuarial losses/(gains)
645

 
593

 
5,712

 
5,062

 
(7
)
 
(173
)
 
6,350

 
5,482

Net periodic pension cost/(credit)
$
336

 
$
533

 
$
1,585

 
$
2,526

 
$
(19
)
 
$
(157
)
 
$
1,902

 
$
2,902



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 six months ended June 30:
 
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
$
652

 
$
532

 
$
9,045

 
$
7,500

 
$
—

 
$
—

 
9,697

 
8,032

Interest cost on projected benefit obligations
1,778

 
2,292

 
2,332

 
5,063

 
14

 
32

 
4,124

 
7,387

Expected return on plan assets
(3,048
)
 
(2,944
)
 
(16,104
)
 
(14,519
)
 
—

 
—

 
(19,152
)
 
(17,463
)
Recognition of prior service cost
—

 
—

 
(3,460
)
 
(3,339
)
 
(38
)
 
—

 
(3,498
)
 
(3,339
)
Recognition of actuarial losses/(gains)
1,290

 
1,187

 
11,311

 
10,247

 
(14
)
 
(346
)
 
12,587

 
11,088

Net periodic pension cost/(credit)
$
672

 
$
1,067

 
$
3,124

 
$
4,952

 
$
(38
)
 
$
(314
)
 
$
3,758

 
$
5,705



As previously disclosed in the Company's Annual Report on Form 10-K for the year ended December 31, 2019, the Company expects to make employer contributions of approximately $25.6 million to its non-U.S. pension plans during the year ended December 31, 2020. This estimate may change based upon several factors, including fluctuations in currency exchange rates, actual returns on plan assets and changes in legal requirements.