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Accounts Receivable
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Accounts Receivable
Accounts receivable are net of an allowance for doubtful accounts. The following table summarizes the Company’s allowance for doubtful accounts and the activity for 2019, 2018 and 2017 (in thousands):
 
Year Ended December 31,
 
2019
 
2018
 
2017
Allowance for doubtful accounts, beginning of year
$
4,284

 
$
7,630

 
$
6,457

Charges to costs and expenses
3,136

 
879

 
2,303

Write-offs of uncollectible accounts, net of recoveries
(1,293
)
 
(3,985
)
 
(1,505
)
Business disposals
—

 
(593
)
 
—

Currency translation adjustments
(15
)
 
353

 
375

Allowance for doubtful accounts, end of year
$
6,112

 
$
4,284

 
$
7,630