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Accumulated other comprehensive loss (Tables) | 12 Months Ended
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Dec. 31, 2022
Equity [Abstract] |
Accumulated comprehensive loss | The after-tax changes in the components of accumulated other comprehensive loss were as follows:
| Net Unrealized Loss on Derivative Instruments Qualifying as Hedges | Post- retirement Liability Adjustment | Net Unrealized Gain (Loss) on Available- for-sale Investments | Total Accumulated Other Comprehensive Loss
| (In thousands)
At December 31, 2020 | $ | (984) |  | $ | (47,207) |  | $ | 113 |  | $ | (48,078) |
Other comprehensive income (loss) before reclassifications | — |  | 4,876 |  | (252) |  | 4,624 |
Amounts reclassified from accumulated other comprehensive loss | 446 |  | 1,870 |  | 134 |  | 2,450 |
Net current-period other comprehensive income (loss) | 446 |  | 6,746 |  | (118) |  | 7,074 |
At December 31, 2021 | (538) |  | (40,461) |  | (5) |  | (41,004) |
Other comprehensive income (loss) before reclassifications | — |  | 12,007 |  | (667) |  | 11,340 |
Amounts reclassified to accumulated other comprehensive loss from a regulatory asset | — |  | (3,265) |  | — |  | (3,265) |
Amounts reclassified from accumulated other comprehensive loss | 413 |  | 1,819 |  | 114 |  | 2,346 |
Net current-period other comprehensive income (loss) | 413 |  | 10,561 |  | (553) |  | 10,421 |
At December 31, 2022 | $ | (125) |  | $ | (29,900) |  | $ | (558) |  | $ | (30,583) |
Reclassification out of accumulated other comprehensive loss | The following amounts were reclassified out of accumulated other comprehensive loss into net income. The amounts presented in parentheses indicate a decrease to net income on the Consolidated Statements of Income. The reclassifications for the years ended December 31 were as follows:
| 2022 | 2021 | Location on Consolidated Statements of Income
| (In thousands) |
Reclassification adjustment for loss on derivative instruments included in net income | $ | (590) |  | $ | (591) |  | Interest expense
| 177 |  | 145 |  | Income taxes
| (413) |  | (446) |  |
Amortization of postretirement liability losses included in net periodic benefit credit | (2,416) |  | (2,485) |  | Other income
| 597 |  | 615 |  | Income taxes
| (1,819) |  | (1,870) |  |
Reclassification adjustment on available-for-sale investments included in net income | (145) |  | (170) |  | Other income
| 31 |  | 36 |  | Income taxes
| (114) |  | (134) |  |
Total reclassifications | $ | (2,346) |  | $ | (2,450) |  |

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