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Nature of Operations and Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 29, 2019 | Jun. 30, 2018
Accounting Policies [Abstract] |  |
Cash Paid for Interest | $ 6,108 | $ 4,268
Cash Paid for Income Taxes, Net of Refunds | 12,975 | 14,808
Non-Cash Investing Activities: |  |
Post-closing adjustment | 0 | 237
Liabilities assumed of acquired business | 30,064 | 0
Non-cash additions to property, plant, and equipment | 306 | 1,033
Non-Cash Financing Activities: |  |
Issuance of Company common stock upon vesting of restricted stock units | 3,743 | 3,264
Dividends declared but unpaid | $ 2,590 | $ 2,442

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