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Billed and Unbilled Receivables (Tables)
 9 Months Ended
Sep. 28, 2019
Receivables [Abstract]  
Schedule of accounts, notes, loans and financing receivable
Billed and Unbilled Receivables consists of the following:
 
September 28, 2019
 
December 29, 2018
Billed receivables
$
114,148

 
$
101,482

Less: allowance for doubtful accounts
(4,557
)
 
(3,158
)
Billed receivables, net
$
109,590

 
$
98,324

 
 
 
 
Unbilled receivables
$
55,206

 
$
44,799

Less: allowance for doubtful accounts
(1,388
)
 
(1,388
)
Unbilled receivables, net
$
53,818

 
$
43,411