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Lines of Credit and Debt (Narrative) (Details)
Share data in Millions, except Per Share data, unless otherwise specified
12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2012
EUR (€)
Dec. 31, 2012
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2012
Senior Unsecured Notes [Member]
EUR (€)
Oct. 12, 2012
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2012
Series A Senior Notes, 3.19% Interest Rate, Due October 16, 2019 [Member]
Senior Unsecured Notes [Member]
USD ($)
Oct. 12, 2012
Series A Senior Notes, 3.19% Interest Rate, Due October 16, 2019 [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2011
Series A Senior Notes, 3.19% Interest Rate, Due October 16, 2019 [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2012
Series B Senior Notes, 3.75% Interest Rate, Due October 16, 2022 [Member]
Senior Unsecured Notes [Member]
USD ($)
Oct. 12, 2012
Series B Senior Notes, 3.75% Interest Rate, Due October 16, 2022 [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2011
Series B Senior Notes, 3.75% Interest Rate, Due October 16, 2022 [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2012
Series C Senior Notes, 3.90% Interest Rate, Due October 16, 2024 [Member]
Senior Unsecured Notes [Member]
USD ($)
Oct. 12, 2012
Series C Senior Notes, 3.90% Interest Rate, Due October 16, 2024 [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2011
Series C Senior Notes, 3.90% Interest Rate, Due October 16, 2024 [Member]
Senior Unsecured Notes [Member]
USD ($)
Dec. 31, 2012
Convertible Notes 3.25% Due in 2026 [Member]
QIAGEN Euro Finance [Member]
USD ($)
Dec. 31, 2011
Convertible Notes 3.25% Due in 2026 [Member]
QIAGEN Euro Finance [Member]
USD ($)
May 31, 2006
Convertible Notes 3.25% Due in 2026 [Member]
QIAGEN Euro Finance [Member]
USD ($)
Dec. 31, 2012
Convertible Notes 1.5% Due in 2024 [Member]
QIAGEN Finance [Member]
USD ($)
Dec. 31, 2011
Convertible Notes 1.5% Due in 2024 [Member]
QIAGEN Finance [Member]
USD ($)
Aug. 31, 2004
Convertible Notes 1.5% Due in 2024 [Member]
QIAGEN Finance [Member]
USD ($)
Debt Instrument [Line Items]                                            
Line of credit facility, revolving credit, amount $ 577,900,000     € 438,000,000                                    
Syndicated Multi-Currency Term Loan       400,000,000                                    
Lines of credit       38,000,000                                    
Stated interest rate, minimum 0.80%                                          
Stated interest rate, maximum 2.35%                                          
Debt Instrument, Commitment Fee Calculation Basis On Applicable Margin, Percentage 35.00%                                          
Line of Credit Facility, Commitment Fee Amount 1,100,000                                          
Debt Instrument, Face Amount             400,000,000   73,000,000     300,000,000     27,000,000              
Long-term Debt, Weighted Average Interest Rate             3.66%                              
Stated interest rates               3.19% 3.19%   3.75% 3.75%   3.90% 3.90%       3.25%     1.50%
Debt Instrument, Term               7 years     10 years     12 years                
Payments of Debt Issuance Costs 2,084,000 0 0                                      
Long-term Debt, Fair Value         400,000,000                                  
Proceeds from debt 400,000,000 44,000,000 3,016,000   220,000,000 170,000,000                                
Total long-term debt 846,992,000 447,622,000           73,000,000   0 300,000,000   0 27,000,000   0 300,000,000 300,000,000   145,000,000 145,000,000  
Less current portion 948,000 1,617,000                                        
Interest expense, long-term debt 17,400,000 22,100,000 24,900,000                                      
Convertible debt                                     300,000,000     150,000,000
Effective interest rate                                 3.70%     1.80%    
Percent of note issued principal value                                 100.00%     100.00%    
Convertible into common shares at the option                                 15.0     11.5    
Debt instrument, convertible, conversion price                                 $ 20.00     $ 12.6449    
Debt Instrument Call Feature, Term                                 7 years          
Percentage of provisional call trigger price                                 130.00%     120.00%    
Debt instrument, fair value                                 $ 358,400,000     $ 209,700,000