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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 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 March 31, 2023 and December 31, 2022 (dollars in thousands):
|  | March 31, 2023 |  |  | December 31, 2022 |
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $552 and $547, respectively |  | $ | 2,076 |  |  | $ | 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 months ended March 31 (dollars in thousands):
|  | Amounts Reclassified from Accumulated Other Comprehensive Loss |
Details about Accumulated Other Comprehensive Loss Components (Affected Line Item in Statement of Income) |  | 2023 |  |  | 2022 |
Amortization of defined benefit pension and postretirement benefit items |  |  |  |  |  |
Amortization of net prior service cost (a) |  | $ | (140 | ) |  | $ | (200 | )
Amortization of net loss (a) |  |  | 1,372 |  |  |  | 2,038 |
Adjustment due to effects of regulation (a) |  |  | (1,255 | ) |  |  | (1,489 | )
Total before tax (b) |  |  | (23 | ) |  |  | 349 |
Tax expense (b) |  |  | 5 |  |  |  | (73 | )
Net of tax (b) |  | $ | (18 | ) |  | $ | 276 |
(a) These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 7 for additional details). (b) Description is also the affected line item on the Condensed Consolidated Statement of Income.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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