Net Periodic Benefit Cost

6 Months Ended

Jun. 30, 2021

Retirement Benefits [Abstract]

NET PERIODIC BENEFIT COST

NET PERIODIC PENSION 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
	2021		2020		2021		2020		2021		2020		2021		2020
Service cost, net	$	374	$	326	$	4,907	$	4,528	$	—	$	—	$	5,281	$	4,854
Interest cost on projected benefit obligations	549		889		858		1,097		2		7		1,409		1,993
Expected return on plan assets	(1,494)		(1,524)		(8,904)		(8,017)		—		—		(10,398)		(9,541)
Recognition of prior service cost	—		—		(465)		(1,735)		(19)		(19)		(484)		(1,754)
Recognition of actuarial losses/(gains)	729		645		6,246		5,712		(9)		(7)		6,966		6,350
Net periodic pension cost/(credit)	$	158	$	336	$	2,642	$	1,585	$	(26)	$	(19)	$	2,774	$	1,902

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
	2021		2020		2021		2020		2021		2020		2021		2020
Service cost, net	$	748	$	652	$	9,852	$	9,045	$	—	$	—	$	10,600	$	9,697
Interest cost on projected benefit obligations	1,098		1,778		1,708		2,332		4		14		2,810		4,124
Expected return on plan assets	(2,988)		(3,048)		(17,875)		(16,104)		—		—		(20,863)		(19,152)
Recognition of prior service cost	—		—		(936)		(3,460)		(38)		(38)		(974)		(3,498)
Recognition of actuarial losses/(gains)	1,458		1,290		12,545		11,311		(18)		(14)		13,985		12,587
Net periodic pension cost/(credit)	$	316	$	672	$	5,294	$	3,124	$	(52)	$	(38)	$	5,558	$	3,758

As previously disclosed in the Company's Annual Report on Form 10-K for the year ended December 31, 2020, the Company expects to make employer contributions of approximately

$27.9 million to its non-U.S. pension plans and employer contributions of approximately $0.2 million to its U.S. post-retirement medical plan during the year ended December 31, 2021. These estimates may change based upon several factors, including fluctuations in currency exchange rates, actual returns on plan assets and changes in legal requirements.