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Comprehensive income (loss) (Tables) | 6 Months Ended
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Jun. 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 June 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 | $ | (2,209 | ) | $ | (33,781 | ) | $ | (140 | ) | $ | (55 | ) | $ | (36,185 | )
Other comprehensive loss before reclassifications | — |  | — |  | (15 | ) | (24 | ) | (39 | )
Amounts reclassified from accumulated other comprehensive loss | 92 |  | 312 |  | — |  | 31 |  | 435 |
Net current-period other comprehensive income (loss) | 92 |  | 312 |  | (15 | ) | 7 |  | 396 |
Balance at end of period | $ | (2,117 | ) | $ | (33,469 | ) | $ | (155 | ) | $ | (48 | ) | $ | (35,789 | )
Three Months Ended June 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 | $ | (2,575 | ) | $ | (35,852 | ) | $ | (175 | ) | $ | 20 |  | $ | (38,582 | )
Other comprehensive income (loss) before reclassifications | — |  | — |  | 31 |  | (30 | ) | 1 |
Amounts reclassified from accumulated other comprehensive loss | 91 |  | 248 |  | — |  | 36 |  | 375 |
Net current-period other comprehensive income | 91 |  | 248 |  | 31 |  | 6 |  | 376 |
Balance at end of period | $ | (2,484 | ) | $ | (35,604 | ) | $ | (144 | ) | $ | 26 |  | $ | (38,206 | )
Six Months Ended June 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 loss before reclassifications | — |  | — |  | (6 | ) | (51 | ) | (57 | )
Amounts reclassified from accumulated other comprehensive loss | 183 |  | 669 |  | — |  | 66 |  | 918 |
Amounts reclassified to accumulated other comprehensive loss from a regulatory asset | — |  | (917 | ) | — |  | — |  | (917 | )
Net current-period other comprehensive income (loss) | 183 |  | (248 | ) | (6 | ) | 15 |  | (56 | )
Balance at end of period | $ | (2,117 | ) | $ | (33,469 | ) | $ | (155 | ) | $ | (48 | ) | $ | (35,789 | )
Six Months Ended June 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 | — |  | — |  | 56 |  | (19 | ) | 37 |
Amounts reclassified from accumulated other comprehensive loss | 183 |  | (1,347 | ) | — |  | 69 |  | (1,095 | )
Net current-period other comprehensive income (loss) | 183 |  | (1,347 | ) | 56 |  | 50 |  | (1,058 | )
Balance at end of period | $ | (2,484 | ) | $ | (35,604 | ) | $ | (144 | ) | $ | 26 |  | $ | (38,206 | )
Reclassification out of accumulated other comprehensive income | Reclassifications out of accumulated other comprehensive loss were as follows:
| Three Months Ended | Six Months Ended | Location on Consolidated Statements of Income
| June 30, | June 30,
| 2017 | 2016 | 2017 | 2016
| (In thousands) |
Reclassification adjustment for loss on derivative instruments included in net income (loss) | $ | (148 | ) | $ | (147 | ) | $ | (295 | ) | $ | (297 | ) | Interest expense
| 56 |  | 56 |  | 112 |  | 114 |  | Income taxes
| (92 | ) | (91 | ) | (183 | ) | (183 | ) |
Amortization of postretirement liability gains (losses) included in net periodic benefit cost (credit) | (502 | ) | (398 | ) | (1,075 | ) | 2,166 |  | (a)
| 190 |  | 150 |  | 406 |  | (819 | ) | Income taxes
| (312 | ) | (248 | ) | (669 | ) | 1,347 |  |
Reclassification adjustment for loss on available-for-sale investments included in net income (loss) | (48 | ) | (55 | ) | (102 | ) | (106 | ) | Other income
| 17 |  | 19 |  | 36 |  | 37 |  | Income taxes
| (31 | ) | (36 | ) | (66 | ) | (69 | ) |
Total reclassifications | $ | (435 | ) | $ | (375 | ) | $ | (918 | ) | $ | 1,095 |  |
(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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