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Nature of Operations and Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019
Accounting Policies [Abstract]
Cash Paid for Interest	$ 5,518	$ 9,711
Cash Paid for Income Taxes, Net of Refunds	9,953	18,037
Non-Cash Investing Activities:
Fair value of assets acquired	9,295	208,558
Cash paid for acquired businesses	(7,565)	(179,489)
Liabilities Assumed of Acquired Businesses	1,730	29,069
Non-cash additions to property, plant, and equipment	101	304
Non-Cash Financing Activities:
Issuance of Company common stock upon vesting of restricted stock units	4,557	3,908
Dividends declared but unpaid	$ 2,762	$ 2,593

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

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