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Accumulated other comprehensive income (loss) (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Accumulated comprehensive loss | The after-tax changes in the components of accumulated other comprehensive loss at December 31, 2020, 2019 and 2018, were as follows:
| Net Unrealized Loss on Derivative Instruments Qualifying as Hedges | Post- retirement 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 (loss) before reclassifications | — |  | (6,151) |  | 134 |  | (6,017) |
Amounts reclassified from accumulated other comprehensive loss | 731 |  | 1,486 |  | 40 |  | 2,257 |
Net current-period other comprehensive income (loss) | 731 |  | (4,665) |  | 174 |  | (3,760) |
At December 31, 2019 | (1,430) |  | (40,734) |  | 62 |  | (42,102) |
Other comprehensive loss before reclassifications | — |  | (8,395) |  | (1) |  | (8,396) |
Amounts reclassified from accumulated other comprehensive loss | 446 |  | 1,922 |  | 52 |  | 2,420 |
Net current-period other comprehensive income (loss) | 446 |  | (6,473) |  | 51 |  | (5,976) |
At December 31, 2020 | $ | (984) |  | $ | (47,207) |  | $ | 113 |  | $ | (48,078) |
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 for the years ended December 31 were as follows:
| 2020 | 2019 | Location on Consolidated Statements of Income
| (In thousands) |
Reclassification adjustment for loss on derivative instruments included in net income | $ | (591) |  | $ | (591) |  | Interest expense
| 145 |  | (140) |  | Income taxes
| (446) |  | (731) |  |
Amortization of postretirement liability losses included in net periodic benefit cost | (2,552) |  | (1,962) |  | Other income
| 630 |  | 476 |  | Income taxes
| (1,922) |  | (1,486) |  |
Reclassification adjustment for loss on available-for-sale investments included in net income | (66) |  | (50) |  | Other income
| 14 |  | 10 |  | Income taxes
| (52) |  | (40) |  |
Total reclassifications | $ | (2,420) |  | $ | (2,257) |  |

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://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 http://asc.fasb.org/extlink&oid=121641772&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 http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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