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Long-Term Debt (7% Note Purchase Agreement) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2016
USD ($)
shares
Jul. 02, 2016
USD ($)
shares
Apr. 02, 2016
USD ($)
Oct. 01, 2016
USD ($)
shares
Sep. 26, 2015
USD ($)
May 10, 2016
USD ($)
Jan. 02, 2016
USD ($)
Debt Instrument [Line Items]              
Repayment of 7% senior exchangeable notes       $ 40,207 $ 0    
Convertible debt [Member] | 7% senior exchangeable notes due 2017 [Member]              
Debt Instrument [Line Items]              
Long-term debt, outstanding principal amount $ 11,200     $ 11,200     $ 83,300
Debt extinguishment amount   $ 16,500 $ 34,500        
Allianz 7% Notes Purchase Agreement [Member] | Allianz [Member] | Convertible debt [Member] | 7% senior exchangeable notes due 2017 [Member]              
Debt Instrument [Line Items]              
Long-term debt, outstanding principal amount           $ 37,500  
Debt exchange rate (percent)           0.6  
Warrants, percentage of common stock outstanding (percent)           3.30%  
Debt extinguishment amount 21,000 16,500          
Repayment of 7% senior exchangeable notes $ 13,000 $ 10,100          
Warrants, amount issued (shares) | shares 1,255,485 984,342   1,255,485