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Net Income (Loss) Per Share (Details)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jul. 01, 2012
Jun. 30, 2013
Jul. 01, 2012
Common Stock:        
Weighted average basic shares outstanding 393,174 389,978 392,836 389,840
Dilutive effect of stock options and restricted shares 4,710 0 3,953 2,161
Weighted average diluted shares outstanding 397,884 389,978 396,789 392,001
Potential common shares excluded from diluted per share calculation 13,145   15,488 19,541