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TRADE ACCOUNTS RECEIVABLE (Tables)
 12 Months Ended
Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]  
Schedule of trade accounts receivable
TRADE ACCOUNTS RECEIVABLE:
 
December 31, 2017

 
January 1, 2017

 
 
 
 
 
Trade accounts receivable
$
248,419

 
$
283,322

Allowance for doubtful accounts
(5,054
)
 
(5,589
)
 
$
243,365

 
$
277,733

The movement in the allowance for doubtful accounts in respect of trade receivables was as follows:
 
December 31, 2017

 
January 1, 2017

 
 
 
 
 
 
Balance, beginning of fiscal year
$
(5,589
)
 
$
(4,601
)
Bad debt recovery (expense)
(3,689
)
 
92

Write-off of trade accounts receivable
4,224

 
524

Increase due to business acquisitions
—

 
(1,604
)
Balance, end of fiscal year
$
(5,054
)
 
$
(5,589
)