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Accumulated other comprehensive income (loss) (Tables) | 6 Months Ended
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Jun. 30, 2019
Equity [Abstract] |
Accumulated comprehensive loss | The after-tax changes in the components of accumulated other comprehensive income (loss) were as follows:
Six Months Ended June 30, 2019 | 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 | )
Six Months Ended June 30, 2018 | Net Unrealized Gain (Loss) on Derivative Instruments Qualifying as Hedges |  | Postretirement Liability Adjustment |  | Foreign Currency Translation Adjustment |  | Net Unrealized Gain (Loss) on Available-for-sale Investments |  | Total Accumulated Other Comprehensive Loss |
| (In thousands)
At December 31, 2017 | $ | (1,934 | ) | $ | (35,163 | ) | $ | (155 | ) | $ | (82 | ) | $ | (37,334 | )
Other comprehensive loss before reclassifications | — |  | — |  | (2 | ) | (105 | ) | (107 | )
Amounts reclassified from accumulated other comprehensive loss | 92 |  | 418 |  | — |  | 30 |  | 540 |
Net current-period other comprehensive income (loss) | 92 |  | 418 |  | (2 | ) | (75 | ) | 433 |
Reclassification adjustment of prior period tax effects related to TCJA included in accumulated other comprehensive loss | (389 | ) | (7,520 | ) | (33 | ) | (17 | ) | (7,959 | )
At March 31, 2018 | $ | (2,231 | ) | $ | (42,265 | ) | $ | (190 | ) | $ | (174 | ) | $ | (44,860 | )
Other comprehensive loss before reclassifications | — |  | — |  | (59 | ) | (43 | ) | (102 | )
Amounts reclassified from accumulated other comprehensive loss | 95 |  | 449 |  | 249 |  | 34 |  | 827 |
Net current-period other comprehensive income (loss) | 95 |  | 449 |  | 190 |  | (9 | ) | 725 |
At June 30, 2018 | $ | (2,136 | ) | $ | (41,816 | ) | $ | — |  | $ | (183 | ) | $ | (44,135 | )
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 | Six Months Ended | Location on Consolidated Statements of Income
| June 30, | June 30,
| 2019 | 2018 | 2019 | 2018
| (In thousands) |
Reclassification adjustment for loss on derivative instruments included in net income | $ | (147 | ) | $ | (148 | ) | $ | (295 | ) | $ | (296 | ) | Interest expense
| 36 |  | 53 |  | (213 | ) | 109 |  | Income taxes
| (111 | ) | (95 | ) | (508 | ) | (187 | ) |
Amortization of postretirement liability losses included in net periodic benefit cost (credit) | (365 | ) | (594 | ) | (775 | ) | (1,167 | ) | Other income
| 89 |  | 145 |  | 189 |  | 300 |  | Income taxes
| (276 | ) | (449 | ) | (586 | ) | (867 | ) |
Reclassification adjustment for loss on foreign currency translation adjustment included in net income | — |  | (324 | ) | — |  | (324 | ) | Other income
| — |  | 75 |  | — |  | 75 |  | Income taxes
| — |  | (249 | ) | — |  | (249 | ) |
Reclassification adjustment on available-for-sale investments included in net income | (15 | ) | (44 | ) | (50 | ) | (81 | ) | Other income
| 3 |  | 10 |  | 10 |  | 17 |  | Income taxes
| (12 | ) | (34 | ) | (40 | ) | (64 | ) |
Total reclassifications | $ | (399 | ) | $ | (827 | ) | $ | (1,134 | ) | $ | (1,367 | ) |

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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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