Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2025

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

The components of net periodic pension cost and net periodic benefit cost for the RAP and Postretirement Plan were as follows:

	Three Months Ended Jun 30,				Six Months Ended Jun 30,
(in thousands)	2025		2024		2025		2024
RAP
Service cost	$	810	$	881	$	1,619	$	1,755
Interest cost	2,814		2,719		5,628		5,438
Expected return on plan assets	(9,809)		(8,650)		(19,619)		(17,301)
Amortization of prior service cost	(44)		(54)		(89)		(107)
Total net periodic pension cost	$	(6,230)	$	(5,104)	$	(12,460)	$	(10,215)
Postretirement Plan
Interest cost	$	26	$	18	$	53	$	37
Amortization of prior service cost	(19)		(19)		(38)		(38)
Amortization of actuarial loss (gain)	4		(7)		8		(14)
Total net periodic benefit cost	$	12	$	(8)	$	23	$	(15)