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Comprehensive income (loss) | 9 Months Ended
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Sep. 30, 2018
Equity [Abstract] |
Comprehensive income (loss) | Comprehensive income (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 | )
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 The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration