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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, 2023 and December 31, 2022 (dollars in thousands):
|  | June 30, 2023 |  |  | December 31, 2022 |
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $557 and $547, respectively |  | $ | 2,095 |  |  | $ | 2,058 |
Reclassification out of Accumulated Other Comprehensive Loss | The following table details the reclassifications out of accumulated other comprehensive loss to net income by component for the three and six months ended June 30 (dollars in thousands):
|  | Amounts Reclassified from Accumulated Other Comprehensive Loss |
|  | Three months ended June 30, |  |  | Six months ended June 30, |
Details about Accumulated Other Comprehensive Loss Components (Affected Line Item in Statement of Income) |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Amortization of defined benefit pension and postretirement benefit items |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net prior service cost (1) |  | $ | (140 | ) |  | $ | (200 | ) |  | $ | (280 | ) |  | $ | (400 | )
Amortization of net loss (1) |  |  | 1,177 |  |  |  | 1,809 |  |  |  | 2,549 |  |  |  | 3,847 |
Adjustment due to effects of regulation (1) |  |  | (1,061 | ) |  |  | (1,263 | ) |  |  | (2,316 | ) |  |  | (2,752 | )
Total before tax (2) |  |  | (24 | ) |  |  | 346 |  |  |  | (47 | ) |  |  | 695 |
Tax expense (2) |  |  | 5 |  |  |  | (73 | ) |  |  | 10 |  |  |  | (146 | )
Net of tax (2) |  | $ | (19 | ) |  | $ | 273 |  |  | $ | (37 | ) |  | $ | 549 |
(1) These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 7 for additional details). (2) Description is also the affected line item on the Condensed Consolidated Statement of Income.

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