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Significant Accounting Policies (Schedule Of Breakout Of The Company's Derived Revenue) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Significant Accounting Policies [Abstract] |  |  |
Revenue from contracts with customers | $ 168,938 | $ 154,069 | $ 139,234
Interest income | 103 | 92 | 72
Cost recovery income |  | 604 | 2,186
Dividend revenue |  | 43 |
Total revenue | $ 169,041 | $ 154,808 | $ 141,492

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