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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Weighted-average number of common and common equivalent shares outstanding:        
Basic number of common shares outstanding 47,863,618 50,143,568 48,093,155 50,660,278
Dilutive effect of equity awards 550,726 469,114 552,866 468,632
Diluted number of common and common equivalent shares outstanding 48,414,344 50,612,682 48,646,021 51,128,910
Basic net income per common share (in thousands, except per share data):        
Net income $ 37,925 $ 36,198 $ 84,589 $ 90,178
Income allocated to participating securities (291) (279) (660) (720)
Net income available to common shareholders $ 37,634 $ 35,919 $ 83,929 $ 89,458
Basic net income per common share (USD per share) $ 0.79 $ 0.72 $ 1.75 $ 1.77
Diluted net income per common share (in thousands, except per share data):        
Net income $ 37,925 $ 36,198 $ 84,589 $ 90,178
Income allocated to participating securities (289) (278) (656) (715)
Net income available to common shareholders $ 37,636 $ 35,920 $ 83,933 $ 89,463
Diluted net income per common share (USD per share) $ 0.78 $ 0.71 $ 1.73 $ 1.75
Anti-dilutive shares (in shares) 663,531 233,570 596,297 233,570