Pension Plans (Tables)

3 Months Ended

Mar. 31, 2021

Retirement Benefits [Abstract]

Components of net periodic pension cost

The components of net periodic pension cost for these defined benefit pension plans are as follows:

	For the Three Months Ended March 31,
	2021		2020
	(In thousands)
Service cost	$	6,787	$	7,536
Interest cost	1,242		1,247
Expected return on plan assets	(1,429)		(1,374)
Recognized actuarial gain	31		14
Net periodic pension cost	$	6,631	$	7,423

Summary of defined contribution expense

The following table summarizes our defined contribution expense:

	For the Three Months Ended March 31,
	2021		2020
	(In thousands)
Defined contribution expense	$	6,756	$	4,816