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Loss Per Share (Narrative) (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 24, 2020
Sep. 30, 2021
Sep. 24, 2020
Stock Options And Non-Vested Restricted Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Shares excluded from the calculation of diluted weighted average shares 4,797,243 4,484,702 4,797,243 4,484,702
Common Units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Shares excluded from the calculation of diluted weighted average shares 86,188,344 84,531,328 85,601,326 83,678,699