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Accounts Receivable
 12 Months Ended
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [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 2015, 2014 and 2013 (in thousands):
 
Year Ended December 31,
 
2015
 
2014
 
2013
Allowance for doubtful accounts, beginning of year
$
8,014

 
$
7,674

 
$
6,574

Charges to costs and expenses
807

 
1,723

 
1,571

Write-offs of uncollectible accounts, net of recoveries
(1,568
)
 
(961
)
 
(505
)
Currency translation adjustments
(400
)
 
(422
)
 
34

Allowance for doubtful accounts, end of year
$
6,853

 
$
8,014

 
$
7,674