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Accumulated other comprehensive loss (Tables) | 6 Months Ended
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Jun. 30, 2023
Equity [Abstract] |
Accumulated comprehensive loss | The after-tax changes in the components of accumulated other comprehensive loss were as follows:
| Net Unrealized Gain (Loss) on Derivative Instruments Qualifying as Hedges | Postretirement Liability Adjustment |  | Net Unrealized Gain (Loss) on Available-for-sale Investments | Total Accumulated Other Comprehensive Loss
| (In thousands)
At December 31, 2022 | $ | (125) |  | $ | (29,900) |  |  | $ | (558) |  | $ | (30,583) |
Other comprehensive income before reclassifications | — |  | — |  |  | 70 |  | 70 |
Amounts reclassified from accumulated other comprehensive loss | 34 |  | 100 |  |  | 13 |  | 147 |
Net current-period other comprehensive income | 34 |  | 100 |  |  | 83 |  | 217 |
At March 31, 2023 | $ | (91) |  | $ | (29,800) |  |  | $ | (475) |  | $ | (30,366) |
Other comprehensive income before reclassifications | — |  | — |  |  | (84) |  | (84) |
Amounts reclassified from accumulated other comprehensive loss | 47 |  | 387 |  |  | 13 |  | 447 |
Net current-period other comprehensive income (loss) | 47 |  | 387 |  |  | (71) |  | 363 |
Amounts reclassified related to the separation of Knife River | 44 |  | 12,262 |  |  | — |  | 12,306 |
At June 30, 2023 | $ | — |  | $ | (17,151) |  |  | $ | (546) |  | $ | (17,697) |
| Net Unrealized Gain (Loss) on Derivative Instruments Qualifying as Hedges | Postretirement Liability Adjustment |  | Net Unrealized Gain (Loss) on Available-for-sale Investments | Total Accumulated Other Comprehensive Loss
| (In thousands)
At December 31, 2021 | $ | (538) |  | $ | (40,461) |  |  | $ | (5) |  | $ | (41,004) |
Other comprehensive loss before reclassifications | — |  | — |  |  | (320) |  | (320) |
Amounts reclassified from accumulated other comprehensive loss | 112 |  | 445 |  |  | 32 |  | 589 |
Net current-period other comprehensive income (loss) | 112 |  | 445 |  |  | (288) |  | 269 |
At March 31, 2022 | $ | (426) |  | $ | (40,016) |  |  | $ | (293) |  | $ | (40,735) |
Other comprehensive loss before reclassifications | — |  | — |  |  | (128) |  | (128) |
Amounts reclassified to accumulated other comprehensive loss from a regulatory asset | — |  | (3,265) |  |  | — |  | (3,265) |
Amounts reclassified from accumulated other comprehensive loss | 111 |  | 461 |  |  | 25 |  | 597 |
Net current-period other comprehensive income (loss) | 111 |  | (2,804) |  |  | (103) |  | (2,796) |
At June 30, 2022 | $ | (315) |  | $ | (42,820) |  |  | $ | (396) |  | $ | (43,531) |
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 parenthesis indicate a decrease to net income on the Consolidated Statements of Income. The reclassifications were as follows:
| Three Months Ended | Six Months Ended |  | Location on Consolidated Statements of Income
| June 30, | June 30, |
| 2023 | 2022 | 2023 | 2022 |  |
| (In thousands) |
Reclassification adjustment for loss on derivative instruments included in net income | $ | (53) |  | $ | (147) |  | $ | (98) |  | $ | (295) |  |  |  | Interest expense
| 6 |  | 36 |  | 17 |  | 72 |  |  |  | Income taxes
| (47) |  | (111) |  | (81) |  | (223) |  |  |  |
Amortization of postretirement liability losses included in net periodic benefit credit | (518) |  | (609) |  | (652) |  | (1,218) |  |  |  | Other income
| 131 |  | 148 |  | 165 |  | 312 |  |  |  | Income taxes
| (387) |  | (461) |  | (487) |  | (906) |  |  |  |
Reclassification adjustment on available-for-sale investments included in net income | (16) |  | (32) |  | (32) |  | (72) |  |  |  | Other income
| 3 |  | 7 |  | 6 |  | 15 |  |  |  | Income taxes
| (13) |  | (25) |  | (26) |  | (57) |  |  |  |
Total reclassifications | $ | (447) |  | $ | (597) |  | $ | (594) |  | $ | (1,186) |  |  |  |

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