Income Taxes (Schedule Of Components Of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current, federal	$ (36,506)
Current, state	1,033	$ 1,573	$ 2,118
Current, foreign	8,498	(3,359)	14,856
Current, total	(26,975)	(1,786)	16,974
Deferred, federal	17,155	1,792	(66,039)
Deferred, state	(638)	1,622	(4,161)
Deferred, foreign	(3,470)	(6,254)	10,223
Deferred income taxes	13,047	(2,840)	(59,977)
Income tax benefit	$ (13,928)	$ (4,626)	$ (43,003)