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U.S. Government Securities (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |  |
U.S. Government Securities | $ 145,000 | $ 146,900
Gross unrealized gain | 2,900 |
Carrying Value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Due in 1 year | 4,274 |
Due in 1 year through 5 years | 140,718 |
Total | 144,992 |
Fair Value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Due in 1 year | 4,281 |
Due in 1 year through 5 years | 143,632 |
Total | $ 147,913 |

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