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General (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of revenue derived from distribution channels	35.00%	35.00%	35.00%
Trade receivables	$ 132,127	$ 114,801
First Channel Partner [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of revenue derived from distribution channels	18.00%	18.00%	18.00%
Second Channel Partner [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of revenue derived from distribution channels	17.00%	17.00%	17.00%

X

- Definition

For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

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

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-Name Accounting Standards Codification

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-Subparagraph (SX 210.9-03.9)

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-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.5)

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X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



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-Name Accounting Standards Codification

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-Subparagraph (a)

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