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Investments (Narrative) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($)
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 | 7 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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