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Income Taxes (Components Of Provision For Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Federal, Current (expense) benefit $ (99,127) $ (16,870) $ (34,842)
State, Current (expense) benefit (1,088) (294) (240)
Foreign, including foreign withholding tax, Current (expense) benefit (76,199) (15,539) (19,268)
Current (expense) benefit 176,414 32,703 54,350
Federal, Deferred (expense) benefit 16,448 (90,113) (64,301)
State, Deferred (expense) benefit (42,624) (19,654) (21,492)
Foreign, Deferred (expense) benefit 55,563 706 (385)
Deferred (expense) benefit (29,387) 109,061 86,178
Income tax (expense) benefit $ 147,027 $ 141,764 $ 140,528