Income Taxes (Components Of Provision For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal, Current (expense) benefit	$ (74,283)	$ (99,127)	$ (16,870)
State, Current (expense) benefit	(2,069)	(1,088)	(294)
Foreign, including foreign withholding tax, Current (expense) benefit	(31,385)	(76,199)	(15,539)
Current (expense) benefit	107,737	176,414	32,703
Federal, Deferred (expense) benefit	(30,462)	16,448	(90,113)
State, Deferred (expense) benefit	(22,899)	(42,624)	(19,654)
Foreign, Deferred (expense) benefit	14,621	55,563	706
Deferred (expense) benefit	38,740	(29,387)	109,061
Income tax (expense) benefit	$ 146,477	$ 147,027	$ 141,764