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Marketable Securities (Summary of Investment Securities in an Unrealized Loss Position) (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Investments, Debt and Equity Securities [Abstract] |
Unrealized Losses, Less than 12 months | $ (679)
Unrealized Losses, 12 months or more | (121)
Unrealized Losses, Total | (800)
Fair value, Less than 12 months | 41,024
Fair value, 12 months or more | 5,838
Fair value, Total | $ 46,862

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