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Income (Loss) per Unit
 9 Months Ended
Sep. 26, 2021
Earnings Per Unit [Abstract]  
Income (Loss) per Unit Income (Loss) per Unit:
Net income (loss) per limited partner unit was calculated based on the following unit amounts:
 Three months endedNine months ended
(In thousands, except per unit amounts)September 26, 2021September 27, 2020September 26, 2021September 27, 2020
Basic weighted average units outstanding56,628 56,497 56,601 56,469 
Effect of dilutive units:
Deferred units46 — — — 
Performance units92 — — — 
Restricted units217 — — — 
Unit options26 — — — 
Diluted weighted average units outstanding57,009 56,497 56,601 56,469 
Net income (loss) per unit - basic$2.61 $(2.41)$(0.38)$(8.58)
Net income (loss) per unit - diluted$2.60 $(2.41)$(0.38)$(8.58)

There were approximately 0.3 million potentially dilutive units excluded from the computation of diluted loss per limited partner unit for the three months ended September 27, 2020 as their effect would have been anti-dilutive due to the net loss in the period. There were approximately 0.7 million and 0.4 million potentially dilutive units excluded for the nine months ended September 26, 2021 and September 27, 2020, respectively, as their effect would also have been anti-dilutive due to the net loss in each period.