Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2021

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 nine months ended September 30, 2021 and 2020 were as follows:

	Three Months Ended Sep 30,				Nine Months Ended Sep 30,
($ in Thousands)	2021		2020		2021		2020
Components of Net Periodic Benefit Cost
RAP
Service cost	$	1,684	$	1,853	$	5,835	$	6,183
Interest cost	1,682		2,124		4,927		6,139
Expected return on plan assets	(6,395)		(6,386)		(19,256)		(19,196)
Amortization of prior service cost	(19)		(18)		(55)		(55)
Amortization of actuarial loss (gain)	1,346		1,313		3,446		2,923
Total net periodic pension cost	$	(1,701)	$	(1,114)	$	(5,103)	$	(4,006)
Postretirement Plan
Interest cost	$	13	$	20	$	39	$	59
Amortization of prior service cost	(19)		(19)		(56)		(56)
Total net periodic benefit cost	$	(6)	$	1	$	(17)	$	2