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Comprehensive income (loss) | 3 Months Ended
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Mar. 31, 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 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 | )
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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
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Period Type: | duration