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Comprehensive income (loss) (Tables) | 9 Months Ended
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Sep. 30, 2017
Equity [Abstract] |
Comprehensive income (loss) | The after-tax changes in the components of accumulated other comprehensive loss were as follows:
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 | )
Three Months Ended September 30, 2016 | 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 | $ | (2,484 | ) | $ | (35,604 | ) | $ | (144 | ) | $ | 26 |  | $ | (38,206 | )
Other comprehensive loss before reclassifications | — |  | — |  | (4 | ) | (42 | ) | (46 | )
Amounts reclassified from accumulated other comprehensive loss | 92 |  | 236 |  | — |  | 33 |  | 361 |
Net current-period other comprehensive income (loss) | 92 |  | 236 |  | (4 | ) | (9 | ) | 315 |
Balance at end of period | $ | (2,392 | ) | $ | (35,368 | ) | $ | (148 | ) | $ | 17 |  | $ | (37,891 | )
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 a 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 | )
Nine Months Ended September 30, 2016 | 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 | $ | (2,667 | ) | $ | (34,257 | ) | $ | (200 | ) | $ | (24 | ) | $ | (37,148 | )
Other comprehensive income (loss) before reclassifications | — |  | — |  | 52 |  | (65 | ) | (13 | )
Amounts reclassified from accumulated other comprehensive loss | 275 |  | (1,111 | ) | — |  | 106 |  | (730 | )
Net current-period other comprehensive income (loss) | 275 |  | (1,111 | ) | 52 |  | 41 |  | (743 | )
Balance at end of period | $ | (2,392 | ) | $ | (35,368 | ) | $ | (148 | ) | $ | 17 |  | $ | (37,891 | )
Reclassification out of accumulated other comprehensive income | Reclassifications out of accumulated other comprehensive loss were as follows:
| Three Months Ended | Nine Months Ended | Location on Consolidated Statements of Income
| September 30, | September 30,
| 2017 | 2016 | 2017 | 2016
| (In thousands) |
Reclassification adjustment for loss on derivative instruments included in net income (loss) | $ | (148 | ) | $ | (148 | ) | $ | (443 | ) | $ | (445 | ) | Interest expense
| 56 |  | 56 |  | 168 |  | 170 |  | Income taxes
| (92 | ) | (92 | ) | (275 | ) | (275 | ) |
Amortization of postretirement liability gains (losses) included in net periodic benefit cost (credit) | (536 | ) | (379 | ) | (1,611 | ) | 1,787 |  | (a)
| 203 |  | 143 |  | 609 |  | (676 | ) | Income taxes
| (333 | ) | (236 | ) | (1,002 | ) | 1,111 |  |
Reclassification adjustment for loss on available-for-sale investments included in net income (loss) | (41 | ) | (51 | ) | (143 | ) | (163 | ) | Other income
| 14 |  | 18 |  | 50 |  | 57 |  | Income taxes
| (27 | ) | (33 | ) | (93 | ) | (106 | ) |
Total reclassifications | $ | (452 | ) | $ | (361 | ) | $ | (1,370 | ) | $ | 730 |  |
(a) Included in net periodic benefit cost (credit). For more information, see Note 14.

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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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