Pension Plans (Tables)

3 Months Ended

Mar. 31, 2019

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,
	2019			2018
	(In thousands)
Service cost	$	7,977		$	8,416
Interest cost	1,324			1,243
Expected return on plan assets	(1,618		)	(1,442		)
Recognized actuarial gain	(94		)	(35		)
Net periodic pension cost	$	7,589		$	8,182

Summary of defined contribution expense

The following table summarizes our defined contribution expense:

	For the Three Months Ended March 31,
	2019		2018
	(In thousands)
Defined contribution expense	$	4,405	$	3,996