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Accounts Receivable
 12 Months Ended
Dec. 31, 2016
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 2016, 2015 and 2014 (in thousands):
 
Year Ended December 31,
 
2016
 
2015
 
2014
Allowance for doubtful accounts, beginning of year
$
6,853

 
$
8,014

 
$
7,674

Charges to costs and expenses
1,460

 
807

 
1,723

Write-offs of uncollectible accounts, net of recoveries
(1,661
)
 
(1,568
)
 
(961
)
Currency translation adjustments
(195
)
 
(400
)
 
(422
)
Allowance for doubtful accounts, end of year
$
6,457

 
$
6,853

 
$
8,014