Quarterly report pursuant to Section 13 or 15(d)

ACCOUNTS RECEIVABLE Roll-forward of the allowance for doubtful accounts (Details)

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ACCOUNTS RECEIVABLE Roll-forward of the allowance for doubtful accounts (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
December 2019 $ 11,852  
Provision for expected credit losses 19,642 $ 5,386
Accounts receivable balances written off (8,801)  
Other 65  
September 2020 $ 22,758