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Accounts Receivable
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Accounts Receivable Accounts Receivable
We sell our manufactured products to a large number of customers, primarily in the residential housing construction and remodel sectors, broadly dispersed across many domestic and foreign geographic regions. We perform ongoing credit evaluations of our customers to minimize credit risk. We do not usually require collateral for accounts receivable but will require advance payment, guarantees, a security interest in the products sold to a customer, and/or letters of credit in certain situations. Customer accounts receivable converted to notes receivable are primarily collateralized by inventory or other collateral. One window and door customer from our North America segment represents 14.6%, 14.2% , and 16.8% of net revenues in 2019, 2018, and 2017, respectively.
The following is a roll forward of our allowance for doubtful accounts as of December 31:
(amounts in thousands)
2019
 
2018
 
2017
Balance as of January 1,
$
(6,227
)
 
$
(4,468
)
 
$
(3,763
)
Acquisitions (Note 2)
(235
)
 
(1,668
)
 
(268
)
Additions charged to expense
(961
)
 
(2,769
)
 
(1,731
)
Deductions
1,407

 
2,301

 
1,662

Currency translation
49

 
377

 
(368
)
Balance at period end
$
(5,967
)
 
$
(6,227
)
 
$
(4,468
)

The prior period information has been revised. Please refer to Note 32 - Revision of Prior Period Financial Statements.