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Accounts Receivable
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Accounts Receivable
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 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