Segment And Geographic Information (Schedule Of Net Revenues By Geographic Location) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Total revenues	$ 253,227	$ 276,222	$ 262,841
Domestic [Member]
Total revenues	138,274	150,553	144,651
Foreign [Member]
Total revenues	$ 114,953	$ 125,669	$ 118,190