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Comprehensive income (loss) (Tables) | 3 Months Ended
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Mar. 31, 2016
Equity [Abstract] |
Comprehensive income (loss) | The after-tax changes in the components of accumulated other comprehensive loss were as follows:
Three Months Ended March 31, 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 before reclassifications | — |  | — |  | 25 |  | 8 |  | 33 |
Amounts reclassified from accumulated other comprehensive loss | 92 |  | (1,595 | ) | — |  | 36 |  | (1,467 | )
Net current-period other comprehensive income (loss) | 92 |  | (1,595 | ) | 25 |  | 44 |  | (1,434 | )
Balance at end of period | $ | (2,575 | ) | $ | (35,852 | ) | $ | (175 | ) | $ | 20 |  | $ | (38,582 | )
Three Months Ended March 31, 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 | — |  | — |  | (112 | ) | (21 | ) | (133 | )
Amounts reclassified from accumulated other comprehensive loss | 99 |  | 375 |  | 802 |  | 36 |  | 1,312 |
Net current-period other comprehensive income (loss) | 99 |  | 375 |  | 690 |  | 15 |  | 1,179 |
Balance at end of period | $ | (2,972 | ) | $ | (37,843 | ) | $ | (139 | ) | $ | 30 |  | $ | (40,924 | )
Reclassification out of accumulated other comprehensive income | Reclassifications out of accumulated other comprehensive loss were as follows:
| Three Months Ended | Location on Consolidated Statements of Income
| March 31,
| 2016 | 2015
| (In thousands) |
Reclassification adjustment for loss on derivative instruments included in net income (loss): |  |  |
Interest rate derivative instruments | $ | (149 | ) | $ | (159 | ) | Interest expense
| 57 |  | 60 |  | Income taxes
| (92 | ) | (99 | ) |
Amortization of postretirement liability gains (losses) included in net periodic benefit cost | 2,564 |  | (605 | ) | (a)
| (969 | ) | 230 |  | Income taxes
| 1,595 |  | (375 | ) |
Reclassification adjustment for loss on foreign currency translation adjustment included in net income (loss) | — |  | (1,292 | ) | Other income
| — |  | 490 |  | Income taxes
| — |  | (802 | ) |
Reclassification adjustment for loss on available-for-sale investments included in net income (loss) | (55 | ) | (55 | ) | Other income
| 19 |  | 19 |  | Income taxes
| (36 | ) | (36 | ) |
Total reclassifications | $ | 1,467 |  | $ | (1,312 | ) |
(a) Included in net periodic benefit cost. For more information, see Note 15.

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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=66004124&loc=SL7669686-108580 + Details
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