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Earnings Per Share (Details)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 28, 2014
Jun. 29, 2013
Jun. 28, 2014
Jun. 29, 2013
Weighted-average common shares outstanding:        
Basic (in shares) 84,620 86,370 84,716 86,483
Effect of dilutive securities:        
Stock options, restricted stock and restricted stock units (in shares) 1,360 1,598 1,473 1,722
Diluted (in shares) 85,980 87,968 86,189 88,205