Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Accruals and reserves	$ 27,105	$ 25,556
Deferred revenue	65,541us-gaap_DeferredTaxAssetsDeferredIncome	55,688us-gaap_DeferredTaxAssetsDeferredIncome
Tax credits	43,211	60,519
Net operating losses	75,318	103,329
Other	12,878us-gaap_DeferredTaxAssetsOther	10,537us-gaap_DeferredTaxAssetsOther
Stock based compensation	63,993	72,074
Depreciation and amortization	0	1,675
Valuation allowance	(15,167)	(26,465)
Total deferred tax assets	272,879us-gaap_DeferredTaxAssetsNet	302,913us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:
Depreciation and amortization	16,835	0
Acquired technology	(82,357)	(136,258)
Prepaid expenses	(9,372)us-gaap_DeferredTaxLiabilitiesOther	(16,258)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities	(108,564)us-gaap_DeferredTaxLiabilities	(152,516)us-gaap_DeferredTaxLiabilities
Total net deferred tax assets	$ 164,315us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 150,397us-gaap_DeferredTaxAssetsLiabilitiesNet

Deferred Tax Assets, Depreciation And Amortization

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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions or inclusions arising from basis amounts and depreciation and amortization methodologies that differ from current enacted tax law and generally accepted accounting principles. Any future deductions 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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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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