Income Taxes (Schedule Of Components Of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current, state	$ 1,573	$ 2,118	$ (750)
Current, foreign	(3,359)	14,856	9,137
Current, total	(1,786)	16,974	8,387
Deferred, federal	1,792	(66,039)	(142,590)
Deferred, state	1,622	(4,161)	6,109
Deferred, foreign	(6,254)	10,223	(3,468)
Deferred income taxes	(2,840)	(59,977)	(139,949)
Income tax benefit	$ (4,626)	$ (43,003)	$ (131,562)