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Revenue Recognition (Schedule Of Breakout Of The Company's Derived Revenue And Other Income) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue Recognition [Abstract]      
Revenue from contracts with customers $ 304,268 $ 218,227 $ 168,938
Interest income 6 21 103
Cost recovery income 158 417  
Dividend income   18  
Total revenue $ 304,432 $ 218,683 $ 169,041