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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Allowance for doubtful accounts and the activity
The following table summarizes the Company’s allowance for doubtful accounts and the activity for 2018, 2017 and 2016 (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Allowance for doubtful accounts, beginning of year
$
7,630

 
$
6,457

 
$
6,853

Charges to costs and expenses
879

 
2,303

 
1,460

Write-offs of uncollectible accounts, net of recoveries
(3,985
)
 
(1,505
)
 
(1,661
)
Business disposals
(593
)
 
—

 
—

Currency translation adjustments
353

 
375

 
(195
)
Allowance for doubtful accounts, end of year
$
4,284

 
$
7,630

 
$
6,457