Income Taxes (Schedule Of Significant Components Of The Provision For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Abstract]
Current income tax expense (benefit), Federal	$ 349	$ 239	$ 297
Current income tax expense (benefit), State	424	391	382
Current income tax expense (benefit), Foreign	(2,233)	5,648	6,158
Total current income tax expense (benefit)	(1,460)	6,278	6,837
Deferred income tax expense (benefit), Federal	(3,263)	17,277	(3,991)
Deferred income tax expense (benefit), State	(5)	6,204	22
Deferred income tax expense (benefit), Foreign	(239)	(922)	430
Total deferred income tax expense (benefit)	(3,507)	22,559	(3,539)
Total income tax expense (benefit)	$ (4,967)	$ 28,837	$ 3,298