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Valuation Reserves
 12 Months Ended
Dec. 29, 2017
Valuation and Qualifying Accounts [Abstract]  
Valuation Reserves
Valuation Reserves

The following tables summarize the activity in our valuation accounts during the fiscal years ended December 29, 2017, December 30, 2016 and December 25, 2015:
 
 
Balance at Beginning of Period
 
Additions Charged to Expense
 
Deductions
 
Balance at End of Period
Allowance for doubtful accounts
 
 
 
 
 
 
 
 
December 29, 2017
 
$
6,848

 
$
4,061

 
$
(2,883
)
 
$
8,026

December 30, 2016
 
5,803

 
3,224

 
(2,179
)
 
6,848

December 25, 2015
 
4,675

 
2,909

 
(1,781
)
 
5,803


Inventory valuation reserve
 
 
 
 
 
 
 
 
December 29, 2017
 
$
2,122

 
$
2,996

 
$
(3,184
)
 
$
1,934

December 30, 2016
 
1,956

 
3,043

 
(2,877
)
 
2,122

December 25, 2015
 
1,130

 
3,288

 
(2,462
)
 
1,956


Allowance for deferred tax assets
 
 
 
 
 
 
 
 
December 29, 2017
 
$
—

 
$
289

 
$
—

 
$
289

December 30, 2016
 
—

 
—

 
—

 
—

December 25, 2015
 
—

 
—

 
—

 
—