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Accumulated other comprehensive loss (Tables) | 9 Months Ended
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Sep. 30, 2022
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, 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) |
| 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, 2020 | $ | (984) |  | $ | (47,207) |  |  | $ | 113 |  | $ | (48,078) |
Other comprehensive loss before reclassifications | — |  | — |  |  | (44) |  | (44) |
Amounts reclassified from accumulated other comprehensive loss | 111 |  | 466 |  |  | 35 |  | 612 |
Net current-period other comprehensive income (loss) | 111 |  | 466 |  |  | (9) |  | 568 |
At March 31, 2021 | $ | (873) |  | $ | (46,741) |  |  | $ | 104 |  | $ | (47,510) |
Other comprehensive loss before reclassifications | — |  | — |  |  | (52) |  | (52) |
Amounts reclassified from accumulated other comprehensive loss | 112 |  | 457 |  |  | 25 |  | 594 |
Net current-period other comprehensive income (loss) | 112 |  | 457 |  |  | (27) |  | 542 |
At June 30, 2021 | $ | (761) |  | $ | (46,284) |  |  | $ | 77 |  | $ | (46,968) |
Other comprehensive loss before reclassifications | — |  | — |  |  | (54) |  | (54) |
Amounts reclassified from accumulated other comprehensive loss | 111 |  | 466 |  |  | 20 |  | 597 |
Net current-period other comprehensive income (loss) | 111 |  | 466 |  |  | (34) |  | 543 |
At September 30, 2021 | $ | (650) |  | $ | (45,818) |  |  | $ | 43 |  | $ | (46,425) |
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,
| 2022 | 2021 | 2022 | 2021
| (In thousands) |
Reclassification adjustment for loss on derivative instruments included in net income | $ | (148) |  | $ | (147) |  | $ | (443) |  | $ | (443) |  | Interest expense
| 37 |  | 36 |  | 109 |  | 109 |  | Income taxes
| (111) |  | (111) |  | (334) |  | (334) |  |
Amortization of postretirement liability losses included in net periodic benefit credit | (609) |  | (617) |  | (1,827) |  | (1,851) |  | Other income
| 148 |  | 151 |  | 460 |  | 462 |  | Income taxes
| (461) |  | (466) |  | (1,367) |  | (1,389) |  |
Reclassification adjustment on available-for-sale investments included in net income | (54) |  | (26) |  | (126) |  | (101) |  | Other income
| 12 |  | 6 |  | 27 |  | 21 |  | Income taxes
| (42) |  | (20) |  | (99) |  | (80) |  |
Total reclassifications | $ | (614) |  | $ | (597) |  | $ | (1,800) |  | $ | (1,803) |  |

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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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