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Accumulated Other Comprehensive Items - Components of AOCI (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jul. 01, 2017
Total Stockholders' Equity [Roll Forward] |  |
Beginning balance | $ 332,504 | $ 284,279
Ending balance | 341,685 | 311,337
Foreign Currency Translation Adjustment [Member] |  |
Total Stockholders' Equity [Roll Forward] |  |
Beginning balance | (17,501) |
Other comprehensive (loss) income before reclassifications | (10,387) |
Reclassifications from AOCI | 0 |
Net current period other comprehensive (loss) income | (10,387) |
Ending balance | (27,888) |
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 | 36 |
Net current period other comprehensive (loss) income | 37 |
Ending balance | (282) |
Net Actuarial Loss on Pension and Other Post- Retirement Benefit Plans [Member] |  |
Total Stockholders' Equity [Roll Forward] |  |
Beginning balance | (8,974) |
Other comprehensive (loss) income before reclassifications | 14 |
Reclassifications from AOCI | 278 |
Net current period other comprehensive (loss) income | 292 |
Ending balance | (8,682) |
Deferred Gain (Loss) on Cash Flow Hedges [Member] |  |
Total Stockholders' Equity [Roll Forward] |  |
Beginning balance | 79 |
Other comprehensive (loss) income before reclassifications | (79) |
Reclassifications from AOCI | (1) |
Net current period other comprehensive (loss) income | (80) |
Ending balance | (1) |
Accumulated Other Comprehensive Items [Member] |  |
Total Stockholders' Equity [Roll Forward] |  |
Beginning balance | (26,715) | (49,637)
Other comprehensive (loss) income before reclassifications | (10,451) |
Reclassifications from AOCI | 313 |
Net current period other comprehensive (loss) income | (10,138) |
Ending balance | $ (36,853) | $ (35,916)

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