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Income Taxes (Summary Of Deferred Tax Assets And Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Net operating loss carryforwards $ 61,059us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 260,253us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deductible goodwill and intangible assets 34,586us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 48,365us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Tax credit carryforwards 100,190us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 4,432us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Deferred revenue, accruals and reserves 103,794us-gaap_DeferredTaxAssetsDeferredIncome 99,934us-gaap_DeferredTaxAssetsDeferredIncome
Capital loss carryforwards and book impairment of investments 1,161,896us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 1,210,529us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Other 4,956us-gaap_DeferredTaxAssetsOther 5,060us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 1,466,481us-gaap_DeferredTaxAssetsGross 1,628,573us-gaap_DeferredTaxAssetsGross
Valuation allowance (1,162,170)us-gaap_DeferredTaxAssetsValuationAllowance (1,203,870)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 304,311us-gaap_DeferredTaxAssetsNet 424,703us-gaap_DeferredTaxAssetsNet
Property and equipment (16,115)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (19,354)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred Tax Liabilities, Undistributed Foreign Earnings 0us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings (167,115)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Convertible debentures (494,625)us-gaap_DeferredTaxLiabilitiesFinancingArrangements (453,825)us-gaap_DeferredTaxLiabilitiesFinancingArrangements
Other (4,151)us-gaap_DeferredTaxLiabilitiesOther (5,656)us-gaap_DeferredTaxLiabilitiesOther
Deferred Tax Liabilities, Gross 514,891us-gaap_DeferredIncomeTaxLiabilities 645,950us-gaap_DeferredIncomeTaxLiabilities
Total deferred tax liabilities $ 210,580us-gaap_DeferredTaxLiabilities $ 221,247us-gaap_DeferredTaxLiabilities