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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 24, 2020	Dec. 25, 2019
Assets [Abstract]
Accumulated depreciation	$ 149,156	$ 147,445
Accumulated amortization	$ 9,036	$ 8,468
Shareholders' deficit
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	135,000,000	135,000,000
Common stock, shares issued	109,719,000	109,415,000
Common stock, shares outstanding	55,709,000	57,095,000
Treasury stock, at cost, shares	54,010,000	52,320,000

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Accumulated amortization of financing lease ROU assets

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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