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EARNINGS PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Sep. 27, 2014
Sep. 28, 2013
Numerator:        
Net income $ 6,781 $ 28,671 $ 53,387 $ 84,697
Denominator:        
Weighted average number of common shares outstanding - Basic 19,417,437 19,344,584 19,398,184 19,320,328
Dilutive effect of options and restricted stock units outstanding under the Company's employee compensation plans 515,875 603,470 480,873 591,792
Weighted average number of common shares outstanding - Diluted 19,933,312 19,948,054 19,879,057 19,912,120