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Accumulated Other Comprehensive Items - Components of AOCI (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 29, 2018 | Sep. 30, 2017
Total Stockholders' Equity [Roll Forward] |  |
Beginning balance | $ 332,504 | $ 284,279
Ending balance | 358,439 | 330,887
Foreign Currency Translation Adjustment [Member] |  |
Total Stockholders' Equity [Roll Forward] |  |
Beginning balance | (17,501) |
Other comprehensive (loss) income before reclassifications | (11,504) |
Reclassifications from AOCI | 0 |
Net current period other comprehensive (loss) income | (11,504) |
Ending balance | (29,005) |
Unrecognized Prior Service Cost on Retirement Benefit Plans [Member] |  |
Total Stockholders' Equity [Roll Forward] |  |
Beginning balance | (319) |
Other comprehensive (loss) income before reclassifications | 1 |
Reclassifications from AOCI | 54 |
Net current period other comprehensive (loss) income | 55 |
Ending balance | (264) |
Net Actuarial Loss on Retirement Benefit Plans [Member] |  |
Total Stockholders' Equity [Roll Forward] |  |
Beginning balance | (8,974) |
Other comprehensive (loss) income before reclassifications | 0 |
Reclassifications from AOCI | 417 |
Net current period other comprehensive (loss) income | 417 |
Ending balance | (8,557) |
Deferred Gain on Cash Flow Hedges [Member] |  |
Total Stockholders' Equity [Roll Forward] |  |
Beginning balance | 79 |
Other comprehensive (loss) income before reclassifications | 34 |
Reclassifications from AOCI | (14) |
Net current period other comprehensive (loss) income | 20 |
Ending balance | 99 |
Accumulated Other Comprehensive Items [Member] |  |
Total Stockholders' Equity [Roll Forward] |  |
Beginning balance | (26,715) | (49,637)
Other comprehensive (loss) income before reclassifications | (11,469) |
Reclassifications from AOCI | 457 |
Net current period other comprehensive (loss) income | (11,012) |
Ending balance | $ (37,727) | $ (28,197)

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