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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 28, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS
MUELLER INDUSTRIES, INC.
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
Years Ended December 28, 2019, December 29, 2018, and December 30, 2017
  
 
 
 
 
Additions
 
 
 
 
(In thousands)
 
Balance at beginning of year
 
Charged to costs and expenses
 
Other additions
 
Deductions
 
Balance at end
of year
 
 
 
 
 
 
 
 
 
 
 
2019
 
 
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
$
836

 
$
(81
)
 
$
263

 
$
248

 
$
770

 
 
 
 
 
 
 
 
 
 
 
Environmental reserves
 
$
23,619

 
$
1,659

 
$
—

 
$
4,412

 
$
20,866

 
 
 
 
 
 
 
 
 
 
 
Valuation allowance for deferred tax assets
 
$
25,311

 
$
2,919

 
$
290

 
$
5,390

 
$
23,130

 
2018
 
 
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
$
980

 
$
(286
)
 
$
220

 
$
78

 
$
836

 
 
 
 
 
 
 
 
 
 
 
Environmental reserves
 
$
28,004

 
$
1,981

 
$
—

 
$
6,366

 
$
23,619

 
 
 
 
 
 
 
 
 
 
 
Valuation allowance for deferred tax assets
 
$
30,316

 
$
1,209

 
$
150

 
$
6,364

 
$
25,311

 
2017
 
 

 
 

 
 

 
 

 
 

Allowance for doubtful accounts
 
$
637

 
$
422

 
$
(61
)
 
$
18

 
$
980

 
 
 
 
 
 
 
 
 
 
 
Environmental reserves
 
$
21,864

 
$
7,491

 
$
—

 
$
1,351

 
$
28,004

 
 
 
 
 
 
 
 
 
 
 
Valuation allowance for deferred tax assets
 
$
18,681

 
$
7

 
$
11,628

(1) 
$
—

 
$
30,316

(1)  
The valuation allowance increased by $11.6 million during 2017 to a balance of $30.3 million as of December 30, 2017.  The change to the valuation allowance was attributable to the recording of valuation allowances against tax attributes generated in 2017 primarily resulting from the Act and increased interest expense in state tax jurisdictions where the Company has no tax liability.