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General (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 29, 2017	Jun. 30, 2016	Jun. 29, 2017	Jun. 30, 2016	Dec. 29, 2016
Summary of Significant Accounting Policies [Line Items]
Depreciation	$ 12,250,000	$ 10,486,000	$ 24,422,000	$ 20,677,000
Percentage Of Cash Dividends			110.00%
Available-for-sale Securities, Fair Value Disclosure	70,000		$ 70,000		$ 93,000
Restricted Cash and Investments, Total	3,058,000		3,058,000
Interest Rate Fair Value Hedge Asset at Fair Value	46,000		46,000		6,000
Trading Securities	$ 3,267,000		3,267,000		$ 1,927,000
Increase (Decrease) In Restricted Cash			$ 2,086,000	$ (11,266,000)

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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