Income Taxes (Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Accruals and reserves	$ 9,193	$ 1,764
Depreciation	(17,381)	(5,970)
Stock-based compensation	39,337	19,084
R&D credits	6,335	4,351
Other	844	461
Deferred tax assets	$ 38,328	$ 19,690

The tax effect as of the balance sheet date of the amount of estimated future tax deductions arising from other temporary differences not otherwise specified in the taxonomy.

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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from equity-based compensation costs, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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- Definition

The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from other provisions, reserves, allowances, and liabilities, which are not otherwise reflected in deferred taxes in the taxonomy, which can only be deducted for tax purposes when relevant losses are realized or actual obligations are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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- Definition

The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from all currently nondeductible expenses reflected in all reserves and accrued liabilities, which can only be deducted for tax purposes when relevant losses are realized or relevant obligations are actually incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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