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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Changes in accumulated other comprehensive income [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | $ 453,654 |
Other comprehensive income before reclassifications | $ (5,928) |  | (3,709) |
Amounts reclassified from accumulated other comprehensive income | (7) |  | (12) |
Total other comprehensive income (loss), net of tax | (5,935) | $ 2,853 | (3,721) | $ 5,541
Balance at end of period | 462,370 |  | 462,370 |
AOCI Attributable to Parent [Member] |  |  |  |
Changes in accumulated other comprehensive income [Roll Forward] |  |  |  |
Balance at beginning of period | (1,895) |  | (4,109) |
Total other comprehensive income (loss), net of tax |  |  | (3,721) |
Balance at end of period | (7,830) |  | (7,830) |
Foreign Currency Translation Adjustments [Member] |  |  |  |
Changes in accumulated other comprehensive income [Roll Forward] |  |  |  |
Balance at beginning of period | (2,006) |  | (4,225) |
Other comprehensive income before reclassifications | (5,935) |  | (3,716) |
Amounts reclassified from accumulated other comprehensive income | 0 |  | 0 |
Total other comprehensive income (loss), net of tax | (5,935) |  | (3,716) |
Balance at end of period | (7,941) |  | (7,941) |
Unrecognized Postretirement Benefit Costs (Credit) [Member] |  |  |  |
Changes in accumulated other comprehensive income [Roll Forward] |  |  |  |
Balance at beginning of period | 111 |  | 116 |
Other comprehensive income before reclassifications | 7 |  | 7 |
Amounts reclassified from accumulated other comprehensive income | (7) |  | (12) |
Total other comprehensive income (loss), net of tax | 0 |  | (5) |
Balance at end of period | $ 111 |  | $ 111 |

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