Income Taxes (Schedule Of Income Tax Expense) (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
U.S. Federal, current	$ (14,831)	$ 85,633	$ (1,032)
State and local, current	10,110	804	498
Foreign, current	29,817	9,047	(2,379)
Current income tax expense (benefit), total	25,096	95,484	(2,913)
U.S. Federal, deferred	(249)	8,337	5,261
State and local, deferred	(550)	(213)	1,196
Foreign, deferred	8,427	(702)	1,933
Deferred income tax expense, total	7,628	7,422	8,390
Total income tax expense	$ 32,724	$ 102,906	$ 5,477