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Accounts Receivable
 12 Months Ended
Dec. 31, 2011
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 2011, 2010 and 2009 (in thousands):
 
Year Ended December 31,
 
2011
 
2010
 
2009
Allowance for doubtful accounts, beginning of year
$
5,104

 
$
1,957

 
$
1,294

Charges to costs and expenses
1,699

 
1,010

 
1,056

Write-offs of uncollectible accounts, net of recoveries
(973
)
 
(92
)
 
(497
)
Business acquisitions and disposals
(148
)
 
2,330

 
12

Currency translation adjustments
(126
)
 
(101
)
 
92

Allowance for doubtful accounts, end of year
$
5,555

 
$
5,104

 
$
1,957