Pension Plans (Tables)

9 Months Ended

Sep. 30, 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 September 30,				For the Nine Months Ended September 30,
	2021		2020		2021		2020
	(In thousands)
Service cost	$	6,548	$	7,722	$	20,083	$	22,803
Interest cost	1,199		1,281		3,682		3,774
Expected return on plan assets	(1,384)		(1,420)		(4,247)		(4,175)
Recognized actuarial loss	32		14		96		42
Net periodic pension cost	$	6,395	$	7,597	$	19,614	$	22,444

Summary of defined contribution expense

The following table summarizes our defined contribution expense:

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2021		2020		2021		2020
	(In thousands)
Defined contribution expense	$	4,807	$	3,618	$	16,803	$	12,159