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STOCKHOLDERS' EQUITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Dec. 29, 2018
Dec. 30, 2017
Stockholders' Equity Note [Abstract]        
Common stock, shares authorized (in shares) 100,000,000   100,000,000  
Common stock, par value (in dollars per share) $ 0.01   $ 0.01000  
Common stock, shares issued (in shares) 50,473,848   49,517,817 49,518,000
Common stock, shares outstanding (in shares) 50,473,848   49,517,817 49,518,000
Preferred stock, shares authorized (in shares) 1,000,000   1,000,000  
Preferred stock, par value (in dollars per share) $ 0.01   $ 0.01000  
Preferred stock, shares issued (in shares) 0   0  
Preferred stock, shares outstanding 0   0  
Authorizations remaining $ 30,000      
Payments to noncontrolling interests 1,045 $ 1,678    
Present value of purchase price 1,200      
Variable consideration in accrued expenses 600      
Variable consideration in other long-term liabilities $ 600