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Accounts Receivable Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]  
Allowance for doubtful accounts and the activity
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