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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 29, 2021	Dec. 30, 2020
Assets
Accumulated depreciation	$ 151,887	$ 146,583
Accumulated amortization	$ 11,217	$ 9,907
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)	64,200,000	63,962,000
Common stock, shares outstanding (in shares)	63,795,000	63,962,000
Treasury stock, at cost, shares (in shares)	405,000	0

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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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