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Update to Significant Accounting Policies - Schedule rollforward of the allowance for credit losses for accounts receivable, notes receivable and other assets (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Dec. 30, 2019
Dec. 29, 2019
Credit Losses        
Retained earnings $ 216,911     $ 205,697
Income tax receivable 1,903     $ 4,024
Allowance for Credit Loss        
Current period (credit) provision for expected credit losses (334) $ 1,646    
Accounts Receivable        
Allowance for Credit Loss        
Balance at beginning of period 7,341      
Balance at beginning of period, adjusted     $ 8,253  
Current period (credit) provision for expected credit losses (234)      
Write-offs charged against the allowance (598)      
Balance at end of period 7,421      
Notes Receivable        
Allowance for Credit Loss        
Balance at beginning of period 3,572      
Balance at beginning of period, adjusted     4,035  
Current period (credit) provision for expected credit losses (244)      
Write-offs charged against the allowance (10)      
Recoveries collected (100)      
Transfers 1,054      
Balance at end of period 4,735      
Interest Receivable        
Allowance for Credit Loss        
Balance at beginning of period 910      
Balance at beginning of period, adjusted     910  
Current period (credit) provision for expected credit losses 144      
Transfers (1,054)      
ASU 2016-13 | Total Adjustments        
Credit Losses        
Retained earnings     1,100  
Income tax receivable     $ 300  
ASU 2016-13 | Total Adjustments | Accounts Receivable        
Allowance for Credit Loss        
Balance at beginning of period 912      
ASU 2016-13 | Total Adjustments | Notes Receivable        
Allowance for Credit Loss        
Balance at beginning of period $ 463