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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Allowance for doubtful accounts and the activity
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