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Accumulated other comprehensive loss (Tables) | 9 Months Ended
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Sep. 30, 2023
Equity [Abstract] |
Accumulated comprehensive loss | Accumulated other 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) |
Other comprehensive loss before reclassifications | — |  | — |  |  | (66) |  | (66) |
Amounts reclassified from accumulated other comprehensive loss | — |  | (6) |  |  | 10 |  | 4 |
Net current-period other comprehensive income (loss) | — |  | (6) |  |  | (56) |  | (62) |
At September 30, 2023 | $ | — |  | $ | (17,157) |  |  | $ | (602) |  | $ | (17,759) |
| 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) |
Other comprehensive loss before reclassifications | — |  | — |  |  | (329) |  | (329) |
Amounts reclassified from accumulated other comprehensive loss | 111 |  | 461 |  |  | 42 |  | 614 |
Net current-period other comprehensive income (loss) | 111 |  | 461 |  |  | (287) |  | 285 |
At September 30, 2022 | $ | (204) |  | $ | (42,359) |  |  | $ | (683) |  | $ | (43,246) |
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 | Nine Months Ended |  | Location on Consolidated Statements of Income
| September 30, | September 30, |
| 2023 | 2022 | 2023 | 2022 |  |
| (In thousands) |
Reclassification adjustment for loss on derivative instruments included in net income | $ | — |  | $ | (148) |  | $ | (98) |  | $ | (443) |  |  |  | Interest expense
| — |  | 37 |  | 17 |  | 109 |  |  |  | Income taxes
| — |  | (111) |  | (81) |  | (334) |  |  |  |
Amortization of postretirement liability losses included in net periodic benefit credit | (92) |  | (609) |  | (744) |  | (1,827) |  |  |  | Other income
| 98 |  | 148 |  | 263 |  | 460 |  |  |  | Income taxes
| 6 |  | (461) |  | (481) |  | (1,367) |  |  |  |
Reclassification adjustment on available-for-sale investments included in net income | (13) |  | (54) |  | (45) |  | (126) |  |  |  | Other income
| 3 |  | 12 |  | 9 |  | 27 |  |  |  | Income taxes
| (10) |  | (42) |  | (36) |  | (99) |  |  |  |
Total reclassifications | $ | (4) |  | $ | (614) |  | $ | (598) |  | $ | (1,800) |  |  |  |
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 | Nine Months Ended |  | Location on Consolidated Statements of Income
| September 30, | September 30, |
| 2023 | 2022 | 2023 | 2022 |  |
| (In thousands) |
Reclassification adjustment for loss on derivative instruments included in net income | $ | — |  | $ | (148) |  | $ | (98) |  | $ | (443) |  |  |  | Interest expense
| — |  | 37 |  | 17 |  | 109 |  |  |  | Income taxes
| — |  | (111) |  | (81) |  | (334) |  |  |  |
Amortization of postretirement liability losses included in net periodic benefit credit | (92) |  | (609) |  | (744) |  | (1,827) |  |  |  | Other income
| 98 |  | 148 |  | 263 |  | 460 |  |  |  | Income taxes
| 6 |  | (461) |  | (481) |  | (1,367) |  |  |  |
Reclassification adjustment on available-for-sale investments included in net income | (13) |  | (54) |  | (45) |  | (126) |  |  |  | Other income
| 3 |  | 12 |  | 9 |  | 27 |  |  |  | Income taxes
| (10) |  | (42) |  | (36) |  | (99) |  |  |  |
Total reclassifications | $ | (4) |  | $ | (614) |  | $ | (598) |  | $ | (1,800) |  |  |  |

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