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Net Income (Loss) Per Share (Details)
In Millions, unless otherwise specified
3 Months Ended
Mar. 30, 2014
Mar. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 6.9 7.5
Warrant [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 4.2 4.2