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Income Taxes (Summary Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Net operating loss carryforwards | $ 70,587 | $ 46,879 |
Deductible goodwill and intangible assets | 1,192 | 10,473 |
Tax credit carryforwards | 52,659 | 59,337 |
Deferred revenue, accruals and reserves | 77,869 | 114,548 |
Capital loss carryforwards and book impairment of investments | 778,430 | 1,161,772 |
Other | 5,584 | 4,791 |
Total deferred tax assets | 986,321 | 1,397,800 |
Valuation allowance | (783,725) | (1,162,101) |
Net deferred tax assets | 202,596 | 235,699 |
Property and equipment | (1,577) | (4,212) |
U.S tax on accumulated foreign earnings | (162,912) |  |
U.S tax on foreign earnings, net of foreign tax credits | 162,353 | 0 | $ 0
foreign withholding tax on unremitted earnings | (33,619) | 0 |
Convertible debentures | (430,088) | (590,921) |
Other | (3,116) | (2,614) |
Deferred Tax Liabilities, Gross | 631,312 | 597,747 |
Total deferred tax liabilities | $ 428,716 | $ 362,048 |

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