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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