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Nature of Operations and Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Accounting Policies [Abstract]      
Cash Paid for Interest $ 1,183 $ 616 $ 1,081
Cash Paid for Income Taxes, Net of Refunds 15,632 11,497 10,035
Non-Cash Investing Activities:      
Fair value of assets of acquired businesses 84,969 0 14,771
Cash paid for acquired businesses (58,894) 0 (12,658)
Liabilities assumed of acquired businesses 26,075 0 2,113
Non-Cash Financing Activities:      
Issuance of company common stock 3,463 3,423 3,220
Dividends declared but unpaid $ 2,078 $ 1,831 $ 1,630