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Accumulated Other Comprehensive Income (Loss) and Shareholders' Equity (Components) (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 29, 2018 | Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning balance | $ 514,577 | $ 501,009
Other comprehensive income (loss) before reclassifications | 524 | 376
Tax (expense) or benefit | (609) | 150
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | (499) | 207
Ending balance | 553,074 | 495,881
Foreign Currency Translation Adjustment |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning balance | 31 | (1,188)
Other comprehensive income (loss) before reclassifications | (1,944) | 779
Tax (expense) or benefit | 0 | 0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 0 | 0
Ending balance | (1,913) | (409)
Unrealized Gains (Losses) on Marketable Securities |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning balance | (132) | (105)
Other comprehensive income (loss) before reclassifications | (125) | 68
Tax (expense) or benefit | 26 | (24)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 0 | 0
Ending balance | (231) | (61)
Pension and Post-retirement Liabilities |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning balance | (5,630) | (5,167)
Other comprehensive income (loss) before reclassifications | 0 | 0
Tax (expense) or benefit | 0 | 0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 0 | 0
Ending balance | (5,630) | (5,167)
Derivative Financial Instruments |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning balance | 2,120 | 1,460
Other comprehensive income (loss) before reclassifications | 2,593 | (471)
Tax (expense) or benefit | (635) | 174
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | (499) | 207
Ending balance | 3,579 | 1,370
Accumulated Other Comprehensive Income (Loss) |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning balance | (3,611) | (5,000)
Ending balance | $ (4,195) | $ (4,267)

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- Definition Amount before tax and reclassification adjustments of 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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