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Income Taxes (Summary Of Deferred Tax Assets And Liabilities) (Details) - USD ($)
Dec. 31, 2018
May 01, 2018
Dec. 31, 2017
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