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Income Taxes (Reconciliation Of Income Tax At Effective Income Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Income tax expense at federal statutory rate	$ (153,199)	$ (209,654)	$ (203,410)
State taxes, net of federal benefit	(35,852)	(13,029)	(14,517)
Differences between statutory rate and foreign effective tax rate	46,928	83,808	79,087
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount	(9,006)	(7,728)	0
Capital loss carryforwards expiration	769,700	0	0
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(773,737)	(5,813)	(511)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	0	(186,800)	0
Transition tax on foreign earnings	(5,602)	162,353	0
U.S tax on foreign earnings, net of foreign tax credits	24,208	4,123	2,881
foreign withholding tax	(812)	33,619	0
Other	(147)	(3,135)	682
Income tax (expense) benefit	$ 147,027	$ 141,764	$ 140,528

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