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Income Taxes (Summary Of Deferred Tax Assets And Liabilities) (Details) - USD ($) | Dec. 31, 2018 | May 01, 2018 | Dec. 31, 2017
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Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Net operating loss carryforwards | $ 40,729,000 |  | $ 70,587,000
Tax credit carryforwards | 3,970,000 |  | 52,659,000
Deferred revenue, accruals and reserves | 74,437,000 |  | 77,869,000
Capital loss carryforwards and book impairment of investments | 0 |  | 778,430,000
Other | 6,724,000 |  | 6,776,000
Total deferred tax assets | 125,860,000 |  | 986,321,000
Valuation allowance | (10,153,000) |  | (783,725,000)
Net deferred tax assets | 115,707,000 |  | 202,596,000
Property and equipment | (2,764,000) |  | (1,577,000)
U.S tax on accumulated foreign earnings | 0 |  | (162,912,000)
foreign withholding tax on unremitted earnings | (2,733,000) |  | (33,619,000)
Convertible debentures | 0 | $ (439,200,000) | (430,088,000)
Other | (5,352,000) |  | (3,116,000)
Deferred Tax Liabilities, Gross | (10,849,000) |  | (631,312,000)
Total deferred tax liabilities | $ 104,858,000.000 |  | $ 428,716,000

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