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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2011
Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
SCHEDULE II
QIAGEN N.V. AND SUBSIDIARIES
SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS
FOR THE YEARS ENDED DECEMBER 31, 2011, 2010 AND 2009
 
(in thousands)
Balance at
Beginning of
Year
 
Provision
Charged to
Expense
 
Write-Offs
 
Foreign
Exchange
and Other
 
Balance at
End of Year
Year Ended December 31, 2009:
 
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
3,070

 
$
1,705

 
$
(562
)
 
$
(811
)
 
$
3,402

Year Ended December 31, 2010:
 
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
3,402

 
$
1,444

 
$
(771
)
 
$
(848
)
 
$
3,227

Year Ended December 31, 2011:
 
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
3,227

 
$
2,131

 
$
(593
)
 
$
(450
)
 
$
4,315