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Net Periodic Benefit Cost
 6 Months Ended
Jun. 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 June 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

 
$
272

 
$
3,799

 
$
3,744

 
$
—

 
$
—

 
4,065

 
4,016

Interest cost on projected benefit obligations
1,146

 
1,061

 
2,520

 
2,131

 
16

 
16

 
3,682

 
3,208

Expected return on plan assets
(1,472
)
 
(1,732
)
 
(7,218
)
 
(7,688
)
 
—

 
—

 
(8,705
)
 
(9,420
)
Recognition of prior service cost
—

 
—

 
(1,637
)
 
(1,727
)
 
—

 
(93
)
 
(1,622
)
 
(1,820
)
Recognition of actuarial losses/(gains)
593

 
1,451

 
5,062

 
5,369

 
(173
)
 
(313
)
 
5,482

 
6,507

Net periodic pension cost/(credit)
$
533

 
$
1,052

 
$
2,526

 
$
1,829

 
$
(157
)
 
$
(390
)
 
$
2,902

 
$
2,491



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
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Service cost, net
$
532

 
$
544

 
$
7,500

 
$
7,664

 
$
—

 
$
—

 
8,032

 
8,208

Interest cost on projected benefit obligations
2,292

 
2,122

 
5,063

 
4,354

 
32

 
32

 
7,387

 
6,508

Expected return on plan assets
(2,944
)
 
(3,464
)
 
(14,519
)
 
(15,675
)
 
—

 
—

 
(17,463
)
 
(19,139
)
Recognition of prior service cost
—

 
—

 
(3,339
)
 
(3,521
)
 
—

 
(186
)
 
(3,339
)
 
(3,707
)
Recognition of actuarial losses/(gains)
1,187

 
2,902

 
10,247

 
10,929

 
(346
)
 
(626
)
 
11,088

 
13,205

Net periodic pension cost/(credit)
$
1,067

 
$
2,104

 
$
4,952

 
$
3,751

 
$
(314
)
 
$
(780
)
 
$
5,705

 
$
5,075



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.