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Marketable Securities (Summary of Investment Securities in an Unrealized Loss Position) (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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Investments, Debt and Equity Securities [Abstract] |
Unrealized Losses, Less than 12 months | $ (38)
Unrealized Losses, 12 months or more | (171)
Unrealized Losses, Total | (209)
Fair value, Less than 12 months | 4,968
Fair value, 12 months or more | 20,100
Fair value, Total | $ 25,068

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