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Accumulated other comprehensive income (loss) (Tables) | 6 Months Ended
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Jun. 30, 2020
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, 2019 | $ | (1,430) |  | $ | (40,734) |  |  | $ | 62 |  | $ | (42,102) |
Other comprehensive income before reclassifications | — |  | — |  |  | 135 |  | 135 |
Amounts reclassified from (to) 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) |
Other comprehensive loss before reclassifications | — |  | — |  |  | (13) |  | (13) |
Amounts reclassified from accumulated other comprehensive loss | 112 |  | 480 |  |  | 7 |  | 599 |
Net current-period other comprehensive income (loss) | 112 |  | 480 |  |  | (6) |  | 586 |
At June 30, 2020 | $ | (1,207) |  | $ | (39,792) |  |  | $ | 190 |  | $ | (40,809) |
| 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, 2018 | $ | (2,161) |  | $ | (36,069) |  |  | $ | (112) |  | $ | (38,342) |
Other comprehensive income before reclassifications | — |  | — |  |  | 39 |  | 39 |
Amounts reclassified from accumulated other comprehensive loss | 397 |  | 310 |  |  | 28 |  | 735 |
Net current-period other comprehensive income | 397 |  | 310 |  |  | 67 |  | 774 |
At March 31, 2019 | $ | (1,764) |  | $ | (35,759) |  |  | $ | (45) |  | $ | (37,568) |
Other comprehensive income before reclassifications | — |  | — |  |  | 79 |  | 79 |
Amounts reclassified from accumulated other comprehensive loss | 111 |  | 276 |  |  | 12 |  | 399 |
Net current-period other comprehensive income | 111 |  | 276 |  |  | 91 |  | 478 |
At June 30, 2019 | $ | (1,653) |  | $ | (35,483) |  |  | $ | 46 |  | $ | (37,090) |
Reclassification out of accumulated other comprehensive loss | The following amounts were reclassified between accumulated other comprehensive loss and 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, |  |
| 2020 | 2019 | 2020 | 2019 |
| (In thousands) |  |  |  |
Reclassification adjustment for loss on derivative instruments included in net income | $ | (148) |  | $ | (147) |  | $ | (295) |  | $ | (295) |  | Interest expense
| 36 |  | 36 |  | 72 |  | (213) |  | Income taxes
| (112) |  | (111) |  | (223) |  | (508) |  |
Amortization of postretirement liability losses included in net periodic benefit cost | (635) |  | (365) |  | (1,246) |  | (775) |  | Other income
| 155 |  | 89 |  | 304 |  | 189 |  | Income taxes
| (480) |  | (276) |  | (942) |  | (586) |  |
Reclassification adjustment on available-for-sale investments included in net income | (9) |  | (15) |  | (8) |  | (50) |  | Other income
| 2 |  | 3 |  | 2 |  | 10 |  | Income taxes
| (7) |  | (12) |  | (6) |  | (40) |  |
Total reclassifications | $ | (599) |  | $ | (399) |  | $ | (1,171) |  | $ | (1,134) |  |

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