Equity Compensation - RSU's (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015
Equity Compensation
Award vesting period, in years	3 years
Restricted Stock
Equity Compensation
Restricted Shares, Granted	86,000
Time based restricted stock
Equity Compensation
Award vesting period, in years	3 years	3 years	3 years
Restricted Shares, Granted	73,000	85,000	76,000
Dividends declared to holders of time-based restricted stock (in dollars)	$ 128,000	$ 117,000	$ 110,000
Dividends declared to holders of time-based restricted stock (in dollars per share)	$ 0.85	$ 0.75	$ 0.63
Performance based restricted stock units \| Executive Management
Equity Compensation
Award vesting period, in years	3 years
Restricted Shares, Granted	13,000	14,000	12,000

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared and applicable to holders of share-based compensation, for example, but not limited to, non-vested shares, stock options, or restricted stock units.

+ References

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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