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Comprehensive income (loss) (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Comprehensive income (loss) | The after-tax changes in the components of accumulated other comprehensive loss were as follows:
Three Months Ended March 31, 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 | — |  | — |  | (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 | )
Balance at end of period | $ | (2,231 | ) | $ | (42,265 | ) | $ | (190 | ) | $ | (174 | ) | $ | (44,860 | )
Three Months Ended March 31, 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 |  | (27 | ) | (18 | )
Amounts reclassified from accumulated other comprehensive loss | 91 |  | 357 |  | — |  | 35 |  | 483 |
Amounts reclassified to accumulated other comprehensive loss from regulatory asset | — |  | (917 | ) | — |  | — |  | (917 | )
Net current-period other comprehensive income (loss) | 91 |  | (560 | ) | 9 |  | 8 |  | (452 | )
Balance at end of period | $ | (2,209 | ) | $ | (33,781 | ) | $ | (140 | ) | $ | (55 | ) | $ | (36,185 | )
Reclassification out of accumulated other comprehensive income | Reclassifications out of accumulated other comprehensive loss were as follows:
| Three Months Ended | Location on Consolidated Statements of Income
| March 31,
| 2018 | 2017
| (In thousands) |
Reclassification adjustment for loss on derivative instruments included in net income | $ | (148 | ) | $ | (147 | ) | Interest expense
| 56 |  | 56 |  | Income taxes
| (92 | ) | (91 | ) |
Amortization of postretirement liability losses included in net periodic benefit cost (credit) | (573 | ) | (574 | ) | Other income
| 155 |  | 217 |  | Income taxes
| (418 | ) | (357 | ) |
Reclassification adjustment for loss on available-for-sale investments included in net income | (37 | ) | (54 | ) | Other income
| 7 |  | 19 |  | Income taxes
| (30 | ) | (35 | ) |
Total reclassifications | $ | (540 | ) | $ | (483 | ) |

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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