Pension and Other Postretirement Benefit Costs

3 Months Ended

Mar. 31, 2022

Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]

Schedule of Net Benefit Costs

The following table provides the components of net periodic benefit cost for the pension and other postretirement benefit plans:

	Three Months Ended March 31,
	Pension Benefits				Other Postretirement Benefits
In thousands	2022		2021		2022		2021
Service cost	$	1,530	$	1,714	$	47	$	55
Interest cost	3,659		3,343		180		165
Expected return on plan assets	(6,427)		(6,099)		—		—
Amortization of prior service credit	—		—		(83)		(117)
Amortization of net actuarial loss	3,198		5,501		99		131
Net periodic benefit cost	1,960		4,459		243		234
Amount allocated to construction	(664)		(726)		(18)		(21)
Net periodic benefit cost charged to expense	1,296		3,733		225		213
Amortization of regulatory balancing account	2,801		2,801		—		—
Net amount charged to expense	$	4,097	$	6,534	$	225	$	213

Schedule of Amounts Recognized in Other Comprehensive Income (Loss)

The following table presents amounts recognized in accumulated other comprehensive loss (AOCL) and the changes in AOCL related to non-qualified employee benefit plans:

	Three Months Ended March 31,
In thousands	2022		2021
Beginning balance	$	(11,404)	$	(12,902)
Amounts reclassified from AOCL:
Amortization of actuarial losses	268		301
Total reclassifications before tax	268		301
Tax benefit	(71)		(80)
Total reclassifications for the period	197		221
Ending balance	$	(11,207)	$	(12,681)