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Comprehensive income (loss) | 6 Months Ended
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Jun. 30, 2017
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 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 | )
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 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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