Employee Benefits (Tables)

6 Months Ended

Jun. 30, 2023

Retirement Benefits [Abstract]

Summary of Components of Net Pension Expense

The components of net pension expense for the plans for the periods indicated are as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(In thousands)
Components of net periodic benefit cost:
Service cost	$	6,338	$	8,092	$	12,677	$	16,184
Interest cost	4,298		2,430		8,596		4,860
Expected return on plan assets	(7,532)		(9,281)		(15,064)		(18,562)
Prior service credit	(2,970)		(2,970)		(5,940)		(5,940)
Recognized net actuarial loss	2,468		2,798		4,936		5,596
Net periodic benefit cost	$	2,602	$	1,069	$	5,205	$	2,138

Schedule of Assets Held in Rabbi Trust

The following table presents the book value, mark-to-market, and fair value of assets held in rabbi trust accounts by asset type:

	As of June 30, 2023						As of December 31, 2022
	Book Value		Mark-to-Market		Fair Value		Book Value		Mark-to-Market		Fair Value
Asset Type	(In thousands)
Cash and cash equivalents	$	6,658	$	—	$	6,658	$	5,575	$	—	$	5,575
Equities (1)	59,616		9,979		69,595		60,056		3,626		63,682
Fixed income	7,026		(641)		6,385		7,799		(770)		7,029
Total assets	$	73,300	$	9,338	$	82,638	$	73,430	$	2,856	$	76,286

(1)Equities include mutual funds and other exchange-traded funds.