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Income Taxes - Reconciliation of the unrecognized tax benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 26, 2019
Dec. 27, 2018
Income Taxes      
Balance at beginning of year $ 0 $ 0 $ 102
Increases due to:      
Tax positions taken in prior years 0 0 0
Tax positions taken in current year 0 0 0
Decreases due to:      
Tax positions taken in prior years 0 0 0
Settlements with taxing authorities 0 0 (102)
Lapse of applicable statute of limitations 0 0 0
Balance at end of year $ 0 $ 0 $ 0