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Shareholders' Equity (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 25, 2019
Dec. 26, 2018
Dec. 27, 2017
AOCI Attributable To Parent, Net Of Tax [Roll Forward]      
Balance as of beginning period $ (133,345) $ (97,360) $ (71,112)
Income tax (expense) benefit 10,320 250 581
Net change in fair value of derivatives (40,486) (2,595) (1,359)
Balance as of ending period (138,064) (133,345) (97,360)
Estimated reclassification from other comprehensive loss to interest expense related to the interest rate swaps over the next 12 months 1,200    
Pensions      
AOCI Attributable To Parent, Net Of Tax [Roll Forward]      
Balance as of beginning period (827) (982) (945)
Other comprehensive gain (loss) before reclassification and tax (25) 96 (172)
Reclassification     21
Income tax (expense) benefit (15) (53) 22
Balance as of ending period (781) (827) (982)
Derivatives      
AOCI Attributable To Parent, Net Of Tax [Roll Forward]      
Balance as of beginning period   (1,334) (462)
Reclassification     (72)
Income tax (expense) benefit     559
Net change in fair value of derivatives     (1,359)
Balance as of ending period     (1,334)
Derivatives      
AOCI Attributable To Parent, Net Of Tax [Roll Forward]      
Balance as of beginning period (3,319)    
Reclassification 291 307  
Income tax (expense) benefit 10,335 303  
Net change in fair value of derivatives (40,486) (2,595)  
Balance as of ending period (33,179) (3,319)  
Net income (loss)      
AOCI Attributable To Parent, Net Of Tax [Roll Forward]      
Reclassification 86 112 92
Accumulated Other Comprehensive Loss      
AOCI Attributable To Parent, Net Of Tax [Roll Forward]      
Balance as of beginning period (4,146) (2,316) (1,407)
Balance as of ending period $ (33,960) $ (4,146) $ (2,316)