Pension and Other Postretirement Benefit Costs

6 Months Ended

Jun. 30, 2023

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 (credit) for the pension and other postretirement benefit plans:

	Three Months Ended June 30,								Six Months Ended June 30,
	Pension Benefits				Other Postretirement Benefits				Pension Benefits				Other Postretirement Benefits
In thousands	2023		2022		2023		2022		2023		2022		2023		2022
Service cost	$	1,049	$	1,529	$	28	$	47	$	2,098	$	3,059	$	56	$	94
Interest cost	5,218		3,659		248		179		10,436		7,318		496		359
Expected return on plan assets	(6,210)		(6,427)		—		—		(12,871)		(12,854)		—		—
Amortization of prior service credit	—		—		—		(84)		—		—		—		(167)
Amortization of net actuarial loss	140		3,199		—		99		279		6,397		—		198
Net periodic benefit cost (credit)	197		1,960		276		241		(58)		3,920		552		484
Amount allocated to construction	(439)		(616)		(9)		(17)		(913)		(1,280)		(20)		(35)
Net periodic benefit cost (credit) charged to expense	(242)		1,344		267		224		(971)		2,640		532		449
Amortization of regulatory balancing account	1,281		1,281		—		—		4,082		4,082		—		—
Net amount charged to expense	$	1,039	$	2,625	$	267	$	224	$	3,111	$	6,722	$	532	$	449

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 June 30,				Six Months Ended June 30,
In thousands	2023		2022		2023		2022
Beginning balance	$	(6,312)	$	(11,207)	$	(6,414)	$	(11,404)
Amounts reclassified from AOCL:
Amortization of actuarial losses	140		268		279		536
Total reclassifications before tax	140		268		279		536
Tax benefit	(37)		(71)		(74)		(142)
Total reclassifications for the period	103		197		205		394
Ending balance	$	(6,209)	$	(11,010)	$	(6,209)	$	(11,010)