Pension Plans (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2020			2019
	(In thousands)
Service cost	$	7,536		$	7,977
Interest cost	1,247			1,324
Expected return on plan assets	(1,374		)	(1,618		)
Recognized actuarial gain	14			(94		)
Net periodic pension cost	$	7,423		$	7,589

Summary of defined contribution expense

The following table summarizes our defined contribution expense:

	For the Three Months Ended March 31,
	2020		2019
	(In thousands)
Defined contribution expense	$	4,816	$	4,405