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Lines of Credit and Debt (Schedule of Total Debt Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Notes Payable, 6.28% Interest Rate, Due Through November 2015 [Member]
Dec. 31, 2011
Notes Payable, 6.28% Interest Rate, Due Through November 2015 [Member]
Dec. 31, 2012
Senior Unsecured Notes [Member]
Series A Senior Notes, 3.19% Interest Rate, Due October 16, 2019 [Member]
Oct. 12, 2012
Senior Unsecured Notes [Member]
Series A Senior Notes, 3.19% Interest Rate, Due October 16, 2019 [Member]
Dec. 31, 2011
Senior Unsecured Notes [Member]
Series A Senior Notes, 3.19% Interest Rate, Due October 16, 2019 [Member]
Dec. 31, 2012
Senior Unsecured Notes [Member]
Series B Senior Notes, 3.75% Interest Rate, Due October 16, 2022 [Member]
Oct. 12, 2012
Senior Unsecured Notes [Member]
Series B Senior Notes, 3.75% Interest Rate, Due October 16, 2022 [Member]
Dec. 31, 2011
Senior Unsecured Notes [Member]
Series B Senior Notes, 3.75% Interest Rate, Due October 16, 2022 [Member]
Dec. 31, 2012
Senior Unsecured Notes [Member]
Series C Senior Notes, 3.90% Interest Rate, Due October 16, 2024 [Member]
Oct. 12, 2012
Senior Unsecured Notes [Member]
Series C Senior Notes, 3.90% Interest Rate, Due October 16, 2024 [Member]
Dec. 31, 2011
Senior Unsecured Notes [Member]
Series C Senior Notes, 3.90% Interest Rate, Due October 16, 2024 [Member]
Dec. 31, 2012
QIAGEN Euro Finance [Member]
Convertible Notes 3.25% Due in 2026 [Member]
Dec. 31, 2011
QIAGEN Euro Finance [Member]
Convertible Notes 3.25% Due in 2026 [Member]
May 31, 2006
QIAGEN Euro Finance [Member]
Convertible Notes 3.25% Due in 2026 [Member]
Dec. 31, 2012
QIAGEN Finance [Member]
Convertible Notes 1.5% Due in 2024 [Member]
Dec. 31, 2011
QIAGEN Finance [Member]
Convertible Notes 1.5% Due in 2024 [Member]
Aug. 31, 2004
QIAGEN Finance [Member]
Convertible Notes 1.5% Due in 2024 [Member]
Debt Instrument [Line Items]                                      
Effective interest rate                           3.70%     1.80%    
Total long-term debt $ 846,992 $ 447,622 $ 1,992 $ 2,622 $ 73,000   $ 0 $ 300,000   $ 0 $ 27,000   $ 0 $ 300,000 $ 300,000   $ 145,000 $ 145,000  
Less current portion 948 1,617                                  
Long-term portion $ 846,044 $ 446,005                                  
Stated interest rates     6.28%   3.19% 3.19%   3.75% 3.75%   3.90% 3.90%       3.25%     1.50%