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Commitments and Contingencies (Narrative) (Details) - USD ($)
12 Months Ended
Sep. 28, 2015
Sep. 27, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Loss Contingencies [Line Items]          
Rent expense     $ 900,000 $ 2,000,000 $ 2,400,000
Royalty Agreement          
Loss Contingencies [Line Items]          
Minimum payments under commitment     $ 53,400    
Percentage of royalty obligations     3.00%    
Royalties expensed     $ 200,000 $ 1,000,000 $ 800,000
Minimum | Royalty Agreement          
Loss Contingencies [Line Items]          
Percentage of royalty obligations     0.50%    
Maximum | Royalty Agreement          
Loss Contingencies [Line Items]          
Percentage of royalty obligations     5.00%    
Related Party Leases          
Loss Contingencies [Line Items]          
Monthly cash capital contributions $ 30,000   $ 30,000    
Annual capital contributions for related party leases 482,500   $ 482,500    
Minimum payments under commitment $ 9,750,000 $ 31,050,000