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Comprehensive income (loss) (Tables) | 9 Months Ended
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Sep. 30, 2018
Equity [Abstract] |
Accumulated comprehensive loss | The after-tax changes in the components of accumulated other comprehensive loss were as follows:
Three Months Ended September 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)
Balance at beginning of period | $ | (2,136 | ) | $ | (41,816 | ) | $ | — |  | $ | (183 | ) | $ | (44,135 | )
Other comprehensive loss before reclassifications | — |  | — |  | — |  | (51 | ) | (51 | )
Amounts reclassified from accumulated other comprehensive loss | 92 |  | 442 |  | — |  | 33 |  | 567 |
Net current-period other comprehensive income (loss) | 92 |  | 442 |  | — |  | (18 | ) | 516 |
Balance at end of period | $ | (2,044 | ) | $ | (41,374 | ) | $ | — |  | $ | (201 | ) | $ | (43,619 | )
Three Months Ended September 30, 2017 | 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)
Balance at beginning of period | $ | (2,117 | ) | $ | (33,469 | ) | $ | (155 | ) | $ | (48 | ) | $ | (35,789 | )
Other comprehensive income (loss) before reclassifications | — |  | — |  | 15 |  | (19 | ) | (4 | )
Amounts reclassified from accumulated other comprehensive loss | 92 |  | 333 |  | — |  | 27 |  | 452 |
Net current-period other comprehensive income | 92 |  | 333 |  | 15 |  | 8 |  | 448 |
Balance at end of period | $ | (2,025 | ) | $ | (33,136 | ) | $ | (140 | ) | $ | (40 | ) | $ | (35,341 | )
Nine Months Ended September 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)
Balance at beginning of period | $ | (1,934 | ) | $ | (35,163 | ) | $ | (155 | ) | $ | (82 | ) | $ | (37,334 | )
Other comprehensive loss before reclassifications | — |  | — |  | (61 | ) | (199 | ) | (260 | )
Amounts reclassified from accumulated other comprehensive loss | 279 |  | 1,309 |  | 249 |  | 97 |  | 1,934 |
Net current-period other comprehensive income (loss) | 279 |  | 1,309 |  | 188 |  | (102 | ) | 1,674 |
Reclassification adjustment of prior period tax effects related to TCJA included in accumulated other comprehensive loss | (389 | ) | (7,520 | ) | (33 | ) | (17 | ) | (7,959 | )
Balance at end of period | $ | (2,044 | ) | $ | (41,374 | ) | $ | — |  | $ | (201 | ) | $ | (43,619 | )
Nine Months Ended September 30, 2017 | 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)
Balance at beginning of period | $ | (2,300 | ) | $ | (33,221 | ) | $ | (149 | ) | $ | (63 | ) | $ | (35,733 | )
Other comprehensive income (loss) before reclassifications | — |  | — |  | 9 |  | (70 | ) | (61 | )
Amounts reclassified from accumulated other comprehensive loss | 275 |  | 1,002 |  | — |  | 93 |  | 1,370 |
Amounts reclassified to accumulated other comprehensive loss from regulatory asset | — |  | (917 | ) | — |  | — |  | (917 | )
Net current-period other comprehensive income | 275 |  | 85 |  | 9 |  | 23 |  | 392 |
Balance at end of period | $ | (2,025 | ) | $ | (33,136 | ) | $ | (140 | ) | $ | (40 | ) | $ | (35,341 | )
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 | Nine Months Ended | Location on Consolidated Statements of Income
| September 30, | September 30,
| 2018 | 2017 | 2018 | 2017
| (In thousands) |
Reclassification adjustment for loss on derivative instruments included in net income | $ | (147 | ) | $ | (148 | ) | $ | (443 | ) | $ | (443 | ) | Interest expense
| 55 |  | 56 |  | 164 |  | 168 |  | Income taxes
| (92 | ) | (92 | ) | (279 | ) | (275 | ) |
Amortization of postretirement liability losses included in net periodic benefit cost (credit) | (584 | ) | (536 | ) | (1,751 | ) | (1,611 | ) | Other income
| 142 |  | 203 |  | 442 |  | 609 |  | Income taxes
| (442 | ) | (333 | ) | (1,309 | ) | (1,002 | ) |
Reclassification adjustment for loss on foreign currency translation adjustment included in net income | — |  | — |  | (324 | ) | — |  | Other income
| — |  | — |  | 75 |  | — |  | Income taxes
| — |  | — |  | (249 | ) | — |  |
Reclassification adjustment on available-for-sale investments included in net income | (42 | ) | (41 | ) | (123 | ) | (143 | ) | Other income
| 9 |  | 14 |  | 26 |  | 50 |  | Income taxes
| (33 | ) | (27 | ) | (97 | ) | (93 | ) |
Total reclassifications | $ | (567 | ) | $ | (452 | ) | $ | (1,934 | ) | $ | (1,370 | ) |

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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=114867106&loc=SL7669686-108580 + Details
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