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Nature of Operations and Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 29, 2018 | Sep. 30, 2017
Accounting Policies [Abstract] |  |
Cash Paid for Interest | $ 5,914 | $ 1,421
Cash Paid for Income Taxes, Net of Refunds | 20,823 | 12,479
Non-Cash Investing Activities: |  |
Estimated post-closing adjustment | 397 | 0
Fair value of assets acquired | 0 | 241,141
Cash paid for acquired businesses | 0 | (206,447)
Liabilities assumed of acquired businesses | 0 | 34,694
Non-cash additions to property, plant and equipment | 783 | 1,938
Non-Cash Financing Activities: |  |
Issuance of Company common stock upon vesting of restricted stock units | 3,976 | 3,018
Dividends declared but unpaid | $ 2,444 | $ 2,312

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