Net periodic pension benefit costs for the Company's significant defined benefit plans include the following components:


	U.S. Plans
	Three Months Ended March 31,
	2021		2020
Service cost	$	26	$	25
Interest cost	77		115
Expected return on plan assets	(305)		(284)
Amortization of prior service (credit)	(11)		(11)
	$	(213)	$	(155)


	Non-U.S. Plans
	Three Months Ended March 31,
	2021		2020
Service cost	$	7	$	6
Interest cost	19		26
Expected return on plan assets	(87)		(84)
Amortization of prior service (credit)	—		—
	$	(61)	$	(52)