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Comprehensive income (loss) (Tables) | 9 Months Ended
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Sep. 30, 2015
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, 2015 | 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 | $ | (2,872 | ) | $ | (37,259 | ) | $ | (130 | ) | $ | 15 |  | $ | (40,246 | )
Other comprehensive loss before reclassifications | — |  | — |  | (73 | ) | (35 | ) | (108 | )
Amounts reclassified from accumulated other comprehensive loss | 100 |  | 382 |  | — |  | 28 |  | 510 |
Net current-period other comprehensive income (loss) | 100 |  | 382 |  | (73 | ) | (7 | ) | 402 |
Balance at end of period | $ | (2,772 | ) | $ | (36,877 | ) | $ | (203 | ) | $ | 8 |  | $ | (39,844 | )
Three Months Ended September 30, 2014 | 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 | $ | (3,408 | ) | $ | (33,287 | ) | $ | (579 | ) | $ | 76 |  | $ | (37,198 | )
Other comprehensive loss before reclassifications | — |  | — |  | (146 | ) | (62 | ) | (208 | )
Amounts reclassified from accumulated other comprehensive loss | 82 |  | 261 |  | — |  | 31 |  | 374 |
Net current-period other comprehensive income (loss) | 82 |  | 261 |  | (146 | ) | (31 | ) | 166 |
Balance at end of period | $ | (3,326 | ) | $ | (33,026 | ) | $ | (725 | ) | $ | 45 |  | $ | (37,032 | )
Nine Months Ended September 30, 2015 | 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 | $ | (3,071 | ) | $ | (38,218 | ) | $ | (829 | ) | $ | 15 |  | $ | (42,103 | )
Other comprehensive loss before reclassifications | — |  | — |  | (176 | ) | (105 | ) | (281 | )
Amounts reclassified from accumulated other comprehensive loss | 299 |  | 1,341 |  | 802 |  | 98 |  | 2,540 |
Net current-period other comprehensive income (loss) | 299 |  | 1,341 |  | 626 |  | (7 | ) | 2,259 |
Balance at end of period | $ | (2,772 | ) | $ | (36,877 | ) | $ | (203 | ) | $ | 8 |  | $ | (39,844 | )
Nine Months Ended September 30, 2014 | 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 | $ | (3,765 | ) | $ | (33,807 | ) | $ | (667 | ) | $ | 34 |  | $ | (38,205 | )
Other comprehensive loss before reclassifications | — |  | — |  | (58 | ) | (89 | ) | (147 | )
Amounts reclassified from accumulated other comprehensive loss | 439 |  | 781 |  | — |  | 100 |  | 1,320 |
Net current-period other comprehensive income (loss) | 439 |  | 781 |  | (58 | ) | 11 |  | 1,173 |
Balance at end of period | $ | (3,326 | ) | $ | (33,026 | ) | $ | (725 | ) | $ | 45 |  | $ | (37,032 | )
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,
| 2015 |  | 2014 |  | 2015 |  | 2014 |
| (In thousands) |
Reclassification adjustment for loss on derivative instruments included in net income (loss): |  |  |  |  |
Interest rate derivative instruments | $ | (160 | ) | $ | (160 | ) | $ | (480 | ) | $ | (480 | ) | Interest expense
| 60 |  | 60 |  | 181 |  | 181 |  | Income taxes
| (100 | ) | (100 | ) | (299 | ) | (299 | ) |
Commodity derivative instruments, net of tax | — |  | 18 |  | — |  | (140 | ) | Income (loss) from discontinued operations, net of tax
| (100 | ) | (82 | ) | (299 | ) | (439 | ) |
Amortization of postretirement liability losses included in net periodic benefit cost (credit) | (615 | ) | (420 | ) | (2,222 | ) | (1,258 | ) | (a)
| 233 |  | 159 |  | 881 |  | 477 |  | Income taxes
| (382 | ) | (261 | ) | (1,341 | ) | (781 | ) |
Reclassification adjustment for loss on foreign currency translation adjustment included in net income (loss) | — |  | — |  | (1,293 | ) | — |  | Other income
| — |  | — |  | 491 |  | — |  | Income taxes
| — |  | — |  | (802 | ) | — |  |
Reclassification adjustment for loss on available-for-sale investments included in net income (loss) | (43 | ) | (47 | ) | (151 | ) | (154 | ) | Other income
| 15 |  | 16 |  | 53 |  | 54 |  | Income taxes
| (28 | ) | (31 | ) | (98 | ) | (100 | ) |
Total reclassifications | $ | (510 | ) | $ | (374 | ) | $ | (2,540 | ) | $ | (1,320 | ) |
(a) Included in net periodic benefit cost (credit). For more information, see Note 16.

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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=36458714&loc=SL7669686-108580 + Details
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