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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 23, 2020	Dec. 25, 2019
Assets
Accumulated depreciation	$ 147,510	$ 147,445
Accumulated amortization	$ 9,484	$ 8,468
Shareholders' deficit
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	135,000,000	135,000,000
Common stock, shares issued (in shares)	117,778,000	109,415,000
Common stock, shares outstanding (in shares)	63,768,000	57,095,000
Treasury stock, at cost, shares (in shares)	54,010,000	52,320,000

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