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Borrowings - Conversions (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 6 Months Ended
Jun. 26, 2016
Jun. 28, 2015
Jun. 26, 2016
Jun. 28, 2015
Debt Instrument [Line Items]        
Debt conversion, amount converted     $ 35,197 $ 38
Conversion of convertible notes, shares issued upon conversion 1.5 2.7 2.2 2.5
Loss on extinguishment of debt $ 19,261 $ 10,454 $ 19,261 $ 10,454
Conversion [Member] | Convertible Notes Payable | Convertible Debt        
Debt Instrument [Line Items]        
Principal amount $ 44,300   44,300  
Debt conversion, amount converted     $ 44,300  
Conversion of convertible notes, shares issued upon conversion     0.4  
Loss on extinguishment of debt     $ 3,000  
Dealer Counterparty | Conversion [Member] | Convertible Notes Payable | Convertible Debt        
Debt Instrument [Line Items]        
Conversion of convertible notes, shares issued upon conversion     0.4