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Revenue Recognition (Schedule Of Breakout Of The Company's Derived Revenue And Other Income) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue Recognition [Abstract]        
Revenue from contracts with customers $ 92,185 $ 36,103 $ 164,599 $ 123,760
Interest income 5 6
Cost recovery income   158 655 158
Total revenue $ 92,185 $ 36,266 $ 165,254 $ 123,924