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Commitments And Contingencies (Narrative) (Details) - USD ($) |  |  |  | 9 Months Ended
--- | --- | --- | --- | ---
Jul. 13, 2021 | Jun. 18, 2021 | Oct. 01, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Commitments And Contingencies [Line Items] |  |  |  |  |
(Increase) decrease in prepaid and other assets |  |  |  | $ (2,272,000) | $ 3,056,000
General Diversified Limited Litigation [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Damages sought |  | $ 0 |  |  |
Estimated Litigation Liability |  |  |  | $ 0 |
Cotter, Jr., Derivative Litigation [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Damages sought |  |  | $ 809,000 |  |
California Employment Litigation [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Settlement awarded | $ 4,000,000.0 |  |  |  |

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- Definition Amount of increase (decrease) in prepaid expenses, and assets classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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