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Nature of Operations and Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Accounting Policies [Abstract] |  |  |
Cash Paid for Interest | $ 7,550 | $ 2,624 | $ 1,183
Cash Paid for Income Taxes, Net of Refunds | 25,654 | 20,559 | 15,632
Non-Cash Investing Activities: |  |  |
Estimated post-closing adjustment | 397 | 0 | 0
Fair value of assets of acquired | 0 | 242,048 | 84,969
Cash paid for acquired businesses | 0 | (206,950) | (58,894)
Liabilities Assumed of Acquired Businesses | 0 | 35,098 | 26,075
Non-cash additions to property, plant, and equipment | 917 | 4,620 | 379
Non-Cash Financing Activities: |  |  |
Issuance of Company common stock upon vesting of RSUs | 4,231 | 3,192 | 3,463
Dividends declared but unpaid | $ 2,444 | $ 2,316 | $ 2,078

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