Retirement Plans (Tables)

6 Months Ended

Jun. 30, 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 and six months ended June 30, 2022 and 2021 were as follows:

	Three Months Ended Jun 30,				Six Months Ended Jun 30,
($ in Thousands)	2022		2021		2022		2021
Components of Net Periodic Benefit Cost
RAP
Service cost	$	923	$	2,075	$	1,847	$	4,151
Interest cost	1,772		1,623		3,545		3,245
Expected return on plan assets	(6,736)		(6,430)		(13,472)		(12,861)
Amortization of prior service cost	(63)		(18)		(125)		(37)
Amortization of actuarial loss	74		1,050		147		2,100
Total net periodic pension cost	$	(4,029)	$	(1,701)	$	(8,059)	$	(3,402)
Postretirement Plan
Interest cost	$	13	$	13	$	27	$	26
Amortization of prior service cost	(19)		(19)		(38)		(38)
Total net periodic benefit cost	$	(6)	$	(6)	$	(11)	$	(12)