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Investments (Summary of Investments Included in Other Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
PreAnalytiX GmbH [Member]
Investment [Line Items]
Ownership percentage	50.00%
Equity investments	$ 18,182	$ 15,723
Share of income (loss) for the year	1,972	390	2,969
QBM Cell Science
Investment [Line Items]
Ownership percentage	19.50%
Equity investments	406	395
Share of income (loss) for the year	11	(10)	11
QIAGEN Finance [Member]
Investment [Line Items]
Ownership percentage	100.00%
Equity investments	374	252
Share of income (loss) for the year	122	103	131
QIAGEN Euro Finance [Member]
Investment [Line Items]
Ownership percentage	100.00%
Equity investments	931	622
Share of income (loss) for the year	309	266	273
Pyrobett
Investment [Line Items]
Ownership percentage	19.00%
Equity investments	3,515	3,749
Share of income (loss) for the year	(234)	(178)	(73)
Dx Assays Pte Ltd
Investment [Line Items]
Ownership percentage	33.30%
Equity investments	0	0
Share of income (loss) for the year	0	0	0
Scandinavian Gene Synthesis AB [Member]
Investment [Line Items]
Ownership percentage	40.00%
Equity investments	0	15,714
Share of income (loss) for the year	(23)	23	0
Peak-Service [Member]
Investment [Line Items]
Ownership percentage	40.00%
Equity investments	20	20
Share of income (loss) for the year	$ 0	$ 0	$ 0

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Topic 210

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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