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Income Taxes (Summary Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |
Net operating loss carryforwards | $ 56,108 | $ 61,059
Deductible goodwill and intangible assets | 21,044 | 34,586
Tax credit carryforwards | 86,951 | 100,190
Deferred revenue, accruals and reserves | 106,572 | 103,794
Capital loss carryforwards and book impairment of investments | 1,162,320 | 1,161,896
Other | 5,039 | 4,956
Total deferred tax assets | 1,438,034 | 1,466,481
Valuation allowance | (1,162,604) | (1,162,170)
Net deferred tax assets | 275,430 | 304,311
Property and equipment | (10,787) | (16,115)
Convertible debentures | (538,098) | (494,625)
Other | (3,378) | (4,151)
Deferred Tax Liabilities, Gross | 552,263 | 514,891
Total deferred tax liabilities | $ 276,833 | $ 210,580

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