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Related Party Transactions (Narrative) (Details)
 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2012
QIAGEN Finance [Member]
USD ($)
Dec. 31, 2011
QIAGEN Finance [Member]
USD ($)
Dec. 31, 2012
QIAGEN Euro Finance [Member]
USD ($)
Dec. 31, 2011
QIAGEN Euro Finance [Member]
USD ($)
Dec. 31, 2011
Former Chief Executive Officer [Member]
USD ($)
Dec. 31, 2011
Former Chief Executive Officer [Member]
EUR (€)
Related Party Transaction [Line Items]                
Percentage of interest in a joint venture company     100.00%   100.00%      
Notes payable to related parties     $ 145,000,000 $ 145,000,000 $ 300,000,000 $ 300,000,000    
Accrued interest on loans payable to related parties     4,400,000   2,600,000 3,000,000    
Accounts receivable from related parties 2,651,000 3,606,000 3,400,000   1,300,000 1,600,000    
Related Party Daily Fee               2,750
Fees paid to related parties             100,000  
Due to Affiliate, Current 7,700,000              
Due To Affiliate, Providing Certain Milestones Have Been Achieved $ 2,000,000