Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2024

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 for the three and nine months ended September 30, 2024 and 2023 were as follows:

	Three Months Ended Sep 30,				Nine Months Ended Sep 30,
($ in thousands)	2024		2023		2024		2023
RAP
Service cost	$	508	$	800	$	2,263	$	2,392
Interest cost	2,943		2,794		8,380		8,165
Expected return on plan assets	(8,649)		(8,243)		(25,949)		(24,647)
Amortization of prior service cost	(54)		(63)		(161)		(188)
Amortization of actuarial loss	—		—		—		37
Total net periodic pension cost	$	(5,252)	$	(4,713)	$	(15,467)	$	(14,241)
Postretirement Plan
Interest cost	$	18	$	20	$	54	$	59
Amortization of prior service cost	(19)		(19)		(56)		(56)
Amortization of actuarial (gain)	(7)		(7)		(21)		(22)
Total net periodic benefit cost	$	(8)	$	(6)	$	(23)	$	(19)