Pension Plans (Tables)

6 Months Ended

Jun. 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 June 30,				For the Six Months Ended June 30,
	2020		2019		2020		2019
	(In thousands)
Service cost	$	7,545	$	7,789	$	15,081	$	15,766
Interest cost	1,246		1,305		2,493		2,629
Expected return on plan assets	(1,381)		(1,595)		(2,755)		(3,213)
Recognized actuarial gain	14		(94)		28		(188)
Net periodic pension cost	$	7,424	$	7,405	$	14,847	$	14,994

Summary of defined contribution expense

The following table summarizes our defined contribution expense:

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2020		2019		2020		2019
	(In thousands)
Defined contribution expense	$	3,725	$	3,352	$	8,541	$	7,756