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General (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 28, 2017
Sep. 29, 2016
Sep. 28, 2017
Sep. 29, 2016
Dec. 29, 2016
Summary of Significant Accounting Policies [Line Items]          
Depreciation $ 12,946,000 $ 10,537,000 $ 37,368,000 $ 31,214,000  
Percentage Of Cash Dividends     110.00%    
Available-for-sale Securities, Fair Value Disclosure 70,000   $ 70,000   $ 93,000
Restricted Cash and Investments, Total 3,057,000   3,057,000    
Interest Rate Fair Value Hedge Asset at Fair Value 28,000   28,000   6,000
Trading Securities, Fair Value Disclosure $ 3,859,000   3,859,000   $ 1,927,000
Decrease (increase) in restricted cash     $ (2,438,000) $ 12,479,000