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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill, Impairment Loss | $ 0 | $ 24,091,000 |
Fair Value, Concentration of Credit Risk, Master Netting Arrangements [Member] |  |  |
Fair Value, Concentration of Risk, Accounts Receivable |  | 1,100,000 |
Fair Value, Concentration of Risk, Accounts Payable |  |  | $ 1,200,000
Administrative Service [Member] |  |  |
Revenues |  | $ 400,000 |

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