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Allowance for Doubtful Accounts
6 Months Ended
Jun. 30, 2017
Receivables [Abstract]  
Allowance for Doubtful Accounts
Allowance for Doubtful Accounts

The activity of the allowance for doubtful accounts is as follows:
Balance at December 31, 2016
$
2,575

Provision charged to income
1,807

Write-offs
(936
)
Foreign currency translation
55

Balance at June 30, 2017
$
3,501