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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. 30, 2017
Oct. 01, 2016
Non-Cash Investing Activities:    
Fair value of assets acquired $ 241,141 $ 87,060
Cash paid for acquired businesses (206,447) (58,894)
Liabilities assumed of acquired businesses 34,694 28,166
Non-Cash Financing Activities:    
Issuance of Company common stock 3,018 3,260
Dividends declared but unpaid $ 2,312 $ 2,074