Pension and Postretirement Plans (Tables)

3 Months Ended

Mar. 31, 2023

Defined Benefit Pension Plan [Member]

Schedule of Net Benefit Costs

The total benefit arising from the Company’s defined benefit pension plans consists of the following components:

	Three Months Ended   March 31
(in thousands)	2023		2022
Service cost	$	9,243	$	6,031
Interest cost	11,534		7,670
Expected return on assets	(38,338)		(41,963)
Amortization of prior service cost	410		709
Recognized actuarial gain	(10,140)		(17,229)
Net Periodic Benefit	(27,291)		(44,782)
Special separation benefit expense	4,129		—
Total Benefit	$	(23,162)	$	(44,782)

Schedule of Allocation of Plan Assets

The assets of the Company’s pension plans were allocated as follows:

	As of
	March 31, 2023		December 31, 2022
U.S. equities	57	%	59	%
Private investment funds	17	%	16	%
International equities	12	%	11	%
U.S. stock index fund	7	%	7	%
U.S. fixed income	7	%	7	%
	100	%	100	%

Supplemental Executive Retirement Plan (SERP) [Member]

Schedule of Net Benefit Costs

The total cost arising from the Company’s Supplemental Executive Retirement Plan (SERP) consists of the following components:

	Three Months Ended   March 31
(in thousands)	2023		2022
Service cost	$	148	$	228
Interest cost	1,165		822
Amortization of prior service cost	—		9
Recognized actuarial loss	—		166
Net Periodic Cost	$	1,313	$	1,225

Other Postretirement Benefit Plan, Defined Benefit [Member]

Schedule of Net Benefit Costs

Other Postretirement Plans. The total benefit arising from the Company’s other postretirement plans consists of the following components:

	Three Months Ended   March 31
(in thousands)	2023		2022
Interest cost	$	22	$	24
Amortization of prior service credit	(1)		(2)
Recognized actuarial gain	(626)		(711)
Net Periodic Benefit	$	(605)	$	(689)