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Loss Per Share (Narrative) (Details) - shares
3 Months Ended 6 Months Ended
Jun. 25, 2020
Jun. 27, 2019
Jun. 25, 2020
Jun. 27, 2019
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 3,777,240 1,969,086 3,777,240 2,125,728
Common Units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Shares excluded from the calculation of diluted weighted average shares 84,531,328 81,705,487 83,252,384 81,263,513