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Investments - Additional Information (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 USD ($) Security | Dec. 31, 2018 USD ($) Security
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Debt Securities | $ 30,382 | $ 22,137
Number of securities in unrealized loss position | Security | 8 | 20
Proceeds from sale of investment in fixed maturity securities | $ 5,800 |
Proceeds from Sale of Other Investments | 8,400 |
Investments on deposit with the state insurance department | 4,800 |
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Debt Securities | 25,000 | $ 21,514
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities | Short-term Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Debt Securities | 2,200 | 4,800
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities | Bank Time Deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Debt Securities | 7,700 | 8,100
Corporate Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Debt Securities | $ 5,382 | $ 623

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