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Subsequent Events (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Apr. 17, 2017
item
$ / shares
shares
Apr. 01, 2017
USD ($)
Apr. 02, 2016
USD ($)
Subsequent Events      
Legal expenses   $ 466 $ 823
TRGP Agreement      
Subsequent Events      
Legal expenses   4,200  
Computershare Trust Company, N.A | Rights Agreement | Subsequent Event      
Subsequent Events      
Number of rights declared as dividend for each share | item 1    
Number of shares authorized for the issuance of each right | item 1    
Number of business days following a public announcement 10 days    
Beneficial ownership percentage 15.00%    
Number of business days following the commencement of a tender offer or exchange offer 10 days    
Computershare Trust Company, N.A | Rights Agreement | Series A Preferred Stock | Subsequent Event      
Subsequent Events      
Number of shares that consits of each unit | shares 0.001    
Purchase price per unit | $ / shares $ 6.56    
TRGP | TRGP Agreement      
Subsequent Events      
Prepaid and other current assets   $ 700