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Accumulated Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2018
Accumulated Other Comprehensive Income [Abstract] |
Changes in Accumulated Other Comprehensive Income | Changes in Accumulated Other Comprehensive Income by Component (in thousands)
|  | Foreign Currency Translation Adjustments |  |  | Unrecognized Postretirement Benefit Costs (Credit) |  |  | Total |
Balance at December 31, 2017 |  | $ | (4,225 | ) |  | $ | 116 |  |  | $ | (4,109 | )
Other comprehensive income before reclassifications |  |  | 2,219 |  |  |  | — |  |  |  | 2,219 |
Amounts reclassified from accumulated other comprehensive income |  |  | — |  |  |  | (5 | ) |  |  | (5 | )
Other comprehensive income, net |  |  | 2,219 |  |  |  | (5 | ) |  |  | 2,214 |
Balance at March 31, 2018 |  | $ | (2,006 | ) |  | $ | 111 |  |  | $ | (1,895 | )
Reclassifications out of Accumulated Other Comprehensive Income | Reclassifications Out of Accumulated Other Comprehensive Income (in thousands)
Details About Accumulated Other Comprehensive Income Components |  | Three Months Ended March 31, 2018 |
Amortization of postretirement benefit plans: |  |  |
Prior service benefit (1) |  | $ | — |
Unrecognized gain (1) |  |  | (9 | )
Total before income tax |  |  | (9 | )
Income tax expense |  |  | 4 |
Total reclassifications for the period |  | $ | (5 | )
| (1) | These accumulated other comprehensive income components are included in the computation of net periodic postretirement benefit costs, which are included in other non-operating income, net in our consolidated statements of operations (see Note 12 for additional details).

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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=84228862&loc=SL7669686-108580 + Details
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