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Accounts Receivable Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Schedule of accounts receivable

Accounts receivable consist of the following at December 31, 2019 and 2018:
(in thousands)
 
2019
 
2018
Trade receivables
 
$
334,059

 
$
305,363

Allowance for doubtful accounts
 
(5,674
)
 
(4,904
)
Other allowances
 
(2,644
)
 
(2,019
)
 
 
$
325,741

 
$
298,440
Changes in allowance for doubtful accounts
The following table shows the changes in the allowance for doubtful accounts:
(in thousands)
 
2019
 
2018
 
2017
Balance at January 1
 
$
4,904

 
$
4,771

 
$
4,162

Write-offs
 
(8,588
)
 
(4,676
)
 
(3,665
)
Recoveries
 
1,811

 
1,460

 
960

Increase in allowance
 
7,547

 
4,906

 
3,314

Other (a)
 
—

 
(1,557
)
 
—

Balance at December 31
 
$
5,674

 
$
4,904

 
$
4,771


(a) During the year ended December 31, 2018, the Company entered into a promissory note with one of its customers resulting in a note receivable of $2.6 million and corresponding allowance of $1.3 million, included in other long-term assets. These amounts were previously included in trade receivables and allowance for doubtful accounts, respectively, within accounts receivable. Additionally, the allowance for doubtful accounts balance declined by $0.3 million during the year ended December 31, 2018 in connection with the sale of accounts receivable in the Coleman Floor disposition. See Note 3 for further details.