Goodwill (Changes In The Carrying Amount Of Goodwill By Geographic Reporting Unit) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 United States [Member]	Dec. 31, 2010 United States [Member]	Dec. 31, 2011 Europe [Member]	Dec. 31, 2010 Europe [Member]	Dec. 31, 2011 Asia Pacific [Member]	Dec. 31, 2009 Asia Pacific [Member]
Goodwill [Line Items]
Balance at beginning of period	$ 58,978	$ 48,730	$ 19,947	$ 19,013	$ 32,101	$ 22,787	$ 6,930	$ 6,930
Effect of foreign currency exchange rates	(624)	415			(638)	415	14
Goodwill acquired through acquisitions	49,297	9,833	41,365	934	3,026	8,899	4,906
Balance at end of period	$ 107,651	$ 58,978	$ 61,312	$ 19,947	$ 34,489	$ 32,101	$ 11,850	$ 6,930

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 34

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

+ Details

- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

+ References+ Details