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Investments (Tables)
 12 Months Ended
Dec. 31, 2012
Investments [Abstract]  
Summary of Investments Included in Other Assets
A summary of these equity method investments, which are included in other assets, is as follows:
 
 
 
 
Equity investments
as of December 31,
 
Share of income (loss)
for the years ended December 31,
Company (in thousands)
Ownership
Percentage
 
2012
 
2011
 
2012
 
2011
 
2010
PreAnalytiX GmbH
50.00
%
 
$
18,182

 
$
15,723

 
$
1,972

 
$
390

 
$
2,969

QBM Cell Science
19.50
%
 
$
406

 
$
395

 
$
11

 
$
(10
)
 
$
11

QIAGEN Finance
100.00
%
 
$
374

 
$
252

 
$
122

 
$
103

 
$
131

QIAGEN Euro Finance
100.00
%
 
$
931

 
$
622

 
$
309

 
$
266

 
$
273

Pyrobett
19.00
%
 
$
3,515

 
$
3,749

 
$
(234
)
 
$
(178
)
 
$
(73
)
Dx Assays Pte Ltd
33.30
%
 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Scandinavian Gene Synthesis AB
40.00
%
 
$
—

 
$
15,714

 
$
(23
)
 
$
23

 
$
—

Peak-Service
40.00
%
 
$
20

 
$
20

 
$
—

 
$
—

 
$
—