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STOCKHOLDERS' EQUITY (Narrative) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Stockholders' Equity Note [Abstract]    
Authorizations remaining $ 824,200  
Payments to noncontrolling interests 1,678 $ 0
Present value of purchase price 4,300  
Variable consideration in accrued expenses 1,700  
Variable consideration in other long-term liabilities $ 2,600