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Accumulated Other Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2018
Accumulated Other Comprehensive Income [Abstract] |
Changes in Accumulated Other Comprehensive Income | Changes in Accumulated Other Comprehensive Income by Component (in thousands)
|  | Three Months Ended June 30, 2018 |
|  | Foreign Currency Translation Adjustments |  |  | Unrecognized Postretirement Benefit Costs (Credit) |  |  | Total |
Balance at March 31, 2018 |  | $ | (2,006 | ) |  | $ | 111 |  |  | $ | (1,895 | )
Other comprehensive income before reclassifications |  |  | (5,935 | ) |  |  | 7 |  |  |  | (5,928 | )
Amounts reclassified from accumulated other comprehensive income |  |  | — |  |  |  | (7 | ) |  |  | (7 | )
Other comprehensive income, net |  |  | (5,935 | ) |  |  | — |  |  |  | (5,935 | )
Balance at June 30, 2018 |  | $ | (7,941 | ) |  | $ | 111 |  |  | $ | (7,830 | )
|  | Six Months Ended June 30, 2018 |
|  | 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 |  |  | (3,716 | ) |  |  | 7 |  |  |  | (3,709 | )
Amounts reclassified from accumulated other comprehensive income |  |  | — |  |  |  | (12 | ) |  |  | (12 | )
Other comprehensive income, net |  |  | (3,716 | ) |  |  | (5 | ) |  |  | (3,721 | )
Balance at June 30, 2018 |  | $ | (7,941 | ) |  | $ | 111 |  |  | $ | (7,830 | )
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 June 30, 2018 |  |  | Six Months Ended June 30, 2018 |
Amortization of postretirement benefit plans: |  |  |  |  |  |
Prior service benefit (1) |  | $ | — |  |  | $ | — |
Unrecognized gain (1) |  |  | (12 | ) |  |  | (21 | )
Total before income tax |  |  | (12 | ) |  |  | (21 | )
Income tax expense |  |  | 5 |  |  |  | 9 |
Total reclassifications for the period |  | $ | (7 | ) |  | $ | (12 | )
| (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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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