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Nature of Operations and Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019
Accounting Policies [Abstract]
Cash Paid for Interest	$ 4,186	$ 6,108
Cash Paid for Income Taxes, Net of Refunds	7,036	12,975
Non-Cash Investing Activities:
Fair value of assets acquired	9,164	209,350
Cash paid for acquired businesses	(7,537)	(179,286)
Liabilities Assumed of Acquired Businesses	1,627	30,064
Non-cash additions to property, plant, and equipment	150	306
Non-Cash Financing Activities:
Issuance of Company common stock upon vesting of restricted stock units	4,027	3,743
Dividends declared but unpaid	$ 2,760	$ 2,590

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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