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Net Earnings (Loss) Per Share - Antidilutive Securities (Details)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 28, 2014
Jun. 29, 2013
Jun. 28, 2014
Jun. 29, 2013
Earnings Per Share [Abstract]        
Antidilutive securities 0 4,024 8,949 3,216