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Nature of Operations and Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Accounting Policies [Abstract]
Cash Paid for Interest	$ 2,459	$ 388
Cash Paid for Income Taxes, Net of Refunds	8,455	3,774
Non-Cash Investing Activities:
Estimated post-closing adjustment	400	0
Non-cash additions to property, plant and equipment	1,816	125
Non-Cash Financing Activities:
Issuance of Company common stock upon vesting of restricted stock units	2,755	2,640
Dividends declared but unpaid	$ 2,440	$ 2,310

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

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