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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2023
Accumulated Other Comprehensive Loss [Abstract] |
Schedule of Accumulated Other Comprehensive Loss, Net of Tax | Accumulated other comprehensive loss, net of tax, consisted of the following as of December 31 (dollars in thousands):
|  | 2023 |  |  | 2022 |
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $95 and $547, respectively |  | $ | 357 |  |  | $ | 2,058 |
Reclassification out of Accumulated Other Comprehensive Loss | The following table details the reclassifications out of accumulated other comprehensive loss by component for the years ended December 31 (dollars in thousands):
|  | Amounts Reclassified from Accumulated Other Comprehensive Loss |
Details about Accumulated Other Comprehensive Loss Components (Affected Line Item in Statements of Income) |  | 2023 |  |  | 2022 |  |  | 2021 |
Amortization of defined benefit pension and postretirement benefit items |  |  |  |  |  |  |  |  |
Amortization of net prior service cost (a) |  | $ | (558 | ) |  | $ | (4,095 | ) |  | $ | (793 | )
Amortization of net loss (a) |  |  | 18,872 |  |  |  | 57,650 |  |  |  | 38,070 |
Adjustment due to effects of regulation (a) |  |  | (16,161 | ) |  |  | (42,187 | ) |  |  | (33,050 | )
Total before tax (b) |  |  | 2,153 |  |  |  | 11,368 |  |  |  | 4,227 |
Tax expense (b) |  |  | (452 | ) |  |  | (2,387 | ) |  |  | (888 | )
Net of tax (b) |  | $ | 1,701 |  |  | $ | 8,981 |  |  | $ | 3,339 |
(a) These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 12 for additional details). (b) Description is also the affected line item on the Consolidated Statements of Income.

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