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Accounts Receivable
 12 Months Ended
Dec. 31, 2012
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 2012, 2011 and 2010 (in thousands):
 
Year Ended December 31,
 
2012
 
2011
 
2010
Allowance for doubtful accounts, beginning of year
$
5,556

 
$
5,104

 
$
1,957

Charges to costs and expenses
2,383

 
1,699

 
1,010

Write-offs of uncollectible accounts, net of recoveries
(1,055
)
 
(973
)
 
(92
)
Business acquisitions and disposals
(351
)
 
(148
)
 
2,330

Currency translation adjustments
41

 
(126
)
 
(101
)
Allowance for doubtful accounts, end of year
$
6,574

 
$
5,556

 
$
5,104