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Nature of Operations and Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jul. 01, 2017
Accounting Policies [Abstract] |  |
Cash Paid for Interest | $ 4,268 | $ 366
Cash Paid for Income Taxes, Net of Refunds | 14,808 | 7,076
Non-Cash Investing Activities: |  |
Estimated post-closing adjustment | 237 | 0
Non-cash additions to property, plant and equipment | 1,033 | 390
Non-Cash Financing Activities: |  |
Issuance of Company common stock upon vesting of restricted stock units | 3,264 | 2,814
Dividends declared but unpaid | $ 2,442 | $ 2,311

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