Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2022

Retirement Benefits [Abstract]

Net period benefit cost for the pension and postretirement plans

The components of net periodic pension cost and net periodic benefit cost for the RAP and Postretirement Plan for the three months ended March 31, 2022 and 2021 were as follows:

	Three Months Ended Mar 31,
($ in Thousands)	2022		2021
Components of Net Periodic Benefit Cost
RAP
Service cost	$	923	$	2,075
Interest cost	1,772		1,623
Expected return on plan assets	(6,736)		(6,430)
Amortization of prior service cost	(63)		(18)
Amortization of actuarial loss	74		1,050
Total net periodic pension cost	$	(4,029)	$	(1,701)
Postretirement Plan
Interest cost	$	13	$	13
Amortization of prior service cost	(19)		(19)
Total net periodic benefit cost	$	(6)	$	(6)