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Basis of Presentation and General Information (Narrative) (Details)
$ / shares in Units, shares in Millions
1 Months Ended 2 Months Ended 12 Months Ended
Dec. 31, 2012
$ / shares
Mar. 09, 2017
$ / shares
Dec. 30, 2016
USD ($)
segment
customer
$ / shares
shares
Jan. 01, 2016
USD ($)
customer
$ / shares
shares
Jan. 02, 2015
USD ($)
customer
$ / shares
shares
Basis Of Presentation And General Information [Line Items]          
Restricted cash     $ 0 $ 0  
Dividend declared | $ / shares $ 0.10 $ 0.30 $ 0.26 $ 0.20 $ 0.12
Period of intangible assets amortized     5 years    
Amortization expense     $ 1,100,000 $ 2,207,000 $ 2,212,000
Future amortization expense, 2017     1,500,000    
Future amortization expense, 2018     $ 1,200,000    
Common stock excluded from reconciliation | shares     0.8 0.5 0.3
Number of customers accounted for more than five percent of revenue | customer     0 0 0
Number of operating segments | segment     1    
Minimum [Member]          
Basis Of Presentation And General Information [Line Items]          
Useful life of property and equipments     3 years    
Maximum [Member]          
Basis Of Presentation And General Information [Line Items]          
Useful life of property and equipments     10 years    
Subsequent Event [Member]          
Basis Of Presentation And General Information [Line Items]          
Dividend declared | $ / shares   $ 0.30