Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 28, 2022	Dec. 28, 2021
Condensed Consolidated Balance Sheets
Receivables, allowance for doubtful accounts (in dollars)	$ 44	$ 17
Property and equipment, accumulated depreciation (in dollars)	923,684	869,375
Intangible assets, accumulated amortization (in dollars)	$ 16,511	$ 15,092
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	66,853,296	69,382,418
Common stock, shares outstanding	66,853,296	69,382,418