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Cash Equivalents And Restricted Cash And Securities (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted securities | $ 528,000 | $ 747,000 |
Gross realized gains or losses on cash equivalents | 0 | 0 | $ 0
Money Market Funds [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted securities | 528,000 | 747,000 |
Maturity Date Within Three Months [Member] | Money Market Funds [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted securities | $ 528,000 | 512,000 |
Maturity Date Between Three Months And One Year [Member] | Money Market Funds [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted securities |  | $ 235,000 |
Minimum [Member] | Maturity Date Between Three Months And One Year [Member] | Money Market Funds [Member] | Measurement Input, Expected Term [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted securities maturity period |  | 3 months |
Maximum [Member] | Maturity Date Within Three Months [Member] | Money Market Funds [Member] | Measurement Input, Expected Term [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted securities maturity period | 3 months | 3 months |
Maximum [Member] | Maturity Date Between Three Months And One Year [Member] | Money Market Funds [Member] | Measurement Input, Expected Term [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted securities maturity period |  | 1 year |

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- Definition Period between issuance and maturity of investment other than investment in equity security, investment in debt security and equity method investment, measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition This element represents the current portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions. + References No definition available. + Details
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