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Accumulated other comprehensive income (loss) (Tables) | 3 Months Ended
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Mar. 31, 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 | )
| 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 | )
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 | Location on Consolidated Statements of Income
| March 31,
| 2020 | 2019
| (In thousands) |
Reclassification adjustment for loss on derivative instruments included in net income | $ | (147 | ) | $ | (148 | ) | Interest expense
| 36 |  | (249 | ) | Income taxes
| (111 | ) | (397 | ) |
Amortization of postretirement liability losses included in net periodic benefit cost | (611 | ) | (410 | ) | Other income
| 149 |  | 100 |  | Income taxes
| (462 | ) | (310 | ) |
Reclassification adjustment on available-for-sale investments included in net income | 1 |  | (35 | ) | Other income
| — |  | 7 |  | Income taxes
| 1 |  | (28 | ) |
Total reclassifications | $ | (572 | ) | $ | (735 | ) |

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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