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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Weighted-average number of common and common equivalent shares outstanding:        
Basic number of common shares outstanding 45,990,039 47,303,074 46,399,746 47,829,794
Dilutive effect of equity awards 490,283 541,325 538,422 549,213
Diluted number of common and common equivalent shares outstanding 46,480,322 47,844,399 46,938,168 48,379,007
Basic net income per common share (in thousands, except per share data):        
Net income $ 71,770 $ 82,316 $ 151,506 $ 166,703
Income allocated to participating securities (540) (651) (1,142) (1,311)
Net income available to common shareholders $ 71,230 $ 81,665 $ 150,364 $ 165,392
Basic net income per common share (USD per share) $ 1.55 $ 1.73 $ 3.24 $ 3.46
Diluted net income per common share (in thousands, except per share data):        
Net income $ 71,770 $ 82,316 $ 151,506 $ 166,703
Income allocated to participating securities (536) (645) (1,134) (1,301)
Net income available to common shareholders $ 71,234 $ 81,671 $ 150,372 $ 165,402
Diluted net income per common share (USD per share) $ 1.53 $ 1.71 $ 3.20 $ 3.42
Anti-dilutive shares (in shares) 326,129 662,130 266,646 618,826