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Basis of Presentation and General Information (Narrative) (Details)
$ / shares in Units, shares in Thousands
 1 Months Ended 12 Months Ended
Mar. 05, 2020
$ / shares
Dec. 31, 2012
$ / shares
Dec. 27, 2019
USD ($)
customer
segment
$ / shares
shares
Dec. 28, 2018
USD ($)
customer
$ / shares
shares
Dec. 29, 2017
USD ($)
customer
$ / shares
shares
Dec. 29, 2018
USD ($)
Basis Of Presentation And General Information [Line Items]            
Dividend declared | $ / shares   $ 0.10 $ 0.36 $ 0.34 $ 0.30  
Period of intangible assets amortized     5 years      
Amortization of Intangible Assets     $ 1,036,000 $ 2,369,000 $ 2,090,000  
Future amortization expense, 2020     1,000,000      
Future amortization expense, 2021     900,000      
Future amortization expense, 2022     200,000      
Revenue recognized as a result of change in contract liability     17,800,000 19,100,000    
Deferred commissions     1,600,000 1,200,000    
Commissions expense     1,400,000 $ 1,400,000    
Impairment loss recognized to capitalization of deferred commission     $ 0      
Antidilutive common share equivalents | shares     12 1 19  
Number of customers accounted for more than five percent of revenue | customer     0 0 0  
Number of operating segments | segment     1      
Additional operating liabilities           $ 9,000,000
Additional operating ROU     $ 7,962,000     $ 9,000,000
Minimum [Member]            
Basis Of Presentation And General Information [Line Items]            
Useful life of property and equipment     3 years      
Business relationship agreement period     6 months      
Maximum [Member]            
Basis Of Presentation And General Information [Line Items]            
Useful life of property and equipment     10 years      
Business relationship agreement period     12 months      
Customer contract period     12 months      
Subsequent Event [Member]            
Basis Of Presentation And General Information [Line Items]            
Dividend declared | $ / shares $ 0.38