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Investments (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Investment In Organization [Line Items] |  |
Reclassification of net unrealized losses from accumulated other comprehensive income (AOCI) to retained earnings |  | $ 0
Minimum [Member] |  |
Investment In Organization [Line Items] |  |
Treasury Bills, term | 1 month |
Maximum [Member] |  |
Investment In Organization [Line Items] |  |
Treasury Bills, term | 3 months |
Accounting Standards Update No. 2016-01 [Member] |  |
Investment In Organization [Line Items] |  |
Reclassification of net unrealized losses from accumulated other comprehensive income (AOCI) to retained earnings | $ 7 |

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- Definition Term of Treasury Bills, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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