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Accumulated other comprehensive income (loss) (Tables) | 3 Months Ended
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Mar. 31, 2021
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, 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) |
| 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, 2019 | $ | (1,430) |  | $ | (40,734) |  |  | $ | 62 |  | $ | (42,102) |
Other comprehensive income before reclassifications | — |  | — |  |  | 135 |  | 135 |
Amounts reclassified (to) from accumulated other comprehensive loss | 111 |  | 462 |  |  | (1) |  | 572 |
Net current-period other comprehensive income | 111 |  | 462 |  |  | 134 |  | 707 |
At March 31, 2020 | $ | (1,319) |  | $ | (40,272) |  |  | $ | 196 |  | $ | (41,395) |
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 |  | Location on Consolidated Statements of Income
| March 31, |
| 2021 | 2020 |  |
| (In thousands) |
Reclassification adjustment for loss on derivative instruments included in net income | $ | (148) |  | $ | (147) |  |  |  | Interest expense
| 37 |  | 36 |  |  |  | Income taxes
| (111) |  | (111) |  |  |  |
Amortization of postretirement liability losses included in net periodic benefit cost | (617) |  | (611) |  |  |  | Other income
| 151 |  | 149 |  |  |  | Income taxes
| (466) |  | (462) |  |  |  |
Reclassification adjustment on available-for-sale investments included in net income | (44) |  | 1 |  |  |  | Other income
| 9 |  | — |  |  |  | Income taxes
| (35) |  | 1 |  |  |  |
Total reclassifications | $ | (612) |  | $ | (572) |  |  |  |

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