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Pension and Other Postretirement Benefit Costs
 9 Months Ended
Sep. 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 September 30,Nine Months Ended September 30,
Pension BenefitsOther Postretirement
Benefits		Pension BenefitsOther
Postretirement Benefits
In thousands20232022202320222023202220232022
Service cost$842 $1,022 $27 $34 $2,940 $4,450 $83 $145 
Interest cost5,283 4,260 247 213 15,719 10,945 743 543 
Expected return on plan assets(6,421)(7,076)— — (19,292)(19,274)— — 
Amortization of prior service credit— — — (15)— — — (249)
Amortization of net actuarial loss (gain)139 (1,542)— 57 418 9,459 — 319 
Net periodic benefit cost (credit)(157)(3,336)274 289 (215)5,580 826 758 
Amount allocated to construction(326)(496)(9)(14)(1,239)(1,965)(29)(57)
Net periodic benefit cost (credit) charged to expense(483)(3,832)265 275 (1,454)3,615 797 701 
Amortization of regulatory balancing account675 675 — — 4,757 4,757 — — 
Net amount charged to expense$192 $(3,157)$265 $275 $3,303 $8,372 $797 $701 
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)
The following table presents amounts recognized in accumulated other comprehensive loss (AOCL) and the changes in AOCL related to non-qualified employee benefit plans:
Three Months Ended September 30,Nine Months Ended September 30,
In thousands2023202220232022
Beginning balance$(6,209)$(11,010)$(6,414)$(11,404)
Amounts reclassified from AOCL:
Amortization of actuarial losses139 275 418 811 
Total reclassifications before tax139 275 418 811 
Tax benefit(37)(73)(111)(215)
Total reclassifications for the period102 202 307 596 
Ending balance$(6,107)$(10,808)$(6,107)$(10,808)