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Acquisitions (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2010		Dec. 31, 2009		Dec. 31, 2009 Nokia Corporation [Member]	Apr. 14, 2009 Nokia Corporation [Member]
Restructuring Cost and Reserve [Line Items]
Acquisition purchase price						$ 54,037
Restructuring and other acquisition related costs	588	[1]	9,101	[1]	9,101
Employee severance costs					7,700
Employee severance costs paid					7,237
Amortization of acquired intangible assets					$ 2,738
[1] *) Includes stock-based compensation to employees in the following items: Cost of products and licenses $ 47 $ 49 $ 58 Cost of software updates, maintenance and subscriptions $ 641 $ 984 $ 909 Research and development $ 6,649 $ 7,325 $ 7,471 Selling and marketing $ 5,032 $ 7,279 $ 7,888 General and administrative $ 18,538 $ 19,543 $ 23,509

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- Definition

Business Acquisition Employee Severance Cost paid

+ References

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- Definition

Restructuring and other acquisition related costs

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- Definition

The aggregate expense charged against earnings to allocate the cost of acquired intangible assets. As a noncash expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method.

+ References

No definition available.

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- Definition

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

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