Pension Plans (Tables)

9 Months Ended

Sep. 30, 2020

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,
	2020		2019		2020		2019
	(In thousands)
Service cost	$	7,722	$	7,747	$	22,803	$	23,513
Interest cost	1,281		1,297		3,774		3,926
Expected return on plan assets	(1,420)		(1,585)		(4,175)		(4,798)
Recognized actuarial gain	14		(94)		42		(282)
Net periodic pension cost	$	7,597	$	7,365	$	22,444	$	22,359

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,
	2020		2019		2020		2019
	(In thousands)
Defined contribution expense	$	3,618	$	2,952	$	12,159	$	10,708