Income Taxes (Components Of The Provision) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Abstract]
U.S.	$ (107,757)	$ (5,044)	$ (38,625)
Non-U.S.	2,948	14,420	6,497
Total current tax expense (benefit)	(104,809)	9,376	(32,128)
U.S.	178,523	80,247	(298,998)
Non-U.S.	(2,516)	(97)	(97)
Total deferred tax expense (benefit)	176,007	80,150	(299,095)
Total income tax provision	$ 71,198	$ 89,526	$ (331,223)

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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