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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Allowance for doubtful accounts and the activity
The following table summarizes the Company’s allowance for doubtful accounts and the activity for 2017, 2016 and 2015 (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Allowance for doubtful accounts, beginning of year
$
6,457

 
$
6,853

 
$
8,014

Charges to costs and expenses
2,303

 
1,460

 
807

Write-offs of uncollectible accounts, net of recoveries
(1,505
)
 
(1,661
)
 
(1,568
)
Currency translation adjustments
375

 
(195
)
 
(400
)
Allowance for doubtful accounts, end of year
$
7,630

 
$
6,457

 
$
6,853