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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Sep. 26, 2015
Dec. 31, 2014
Preferred stock, shares authorized 100,000,000 100,000,000
Preferred stock, shares outstanding 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 300,000,000 300,000,000
Common stock, shares issued 80,563,291 80,563,291
Common stock held in treasury, shares 5,262,709 2,541,306
Series A convertible preferred stock    
Preferred stock, shares authorized 10,896,250 10,896,250