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Investments - Additional Information (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) Security | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) Security
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Debt Securities | $ 38,117 |  | $ 36,254
Number of securities in unrealized loss position | Security | 15 |  | 3
Proceeds from sale of investment in fixed maturity securities | $ 2,900 |  |
Proceeds from Sale of Other Investments | 4,400 |  |
Purchases of investments | 5,098 | $ 1,513 |
Investments on deposit with the state insurance department | 4,200 |  |
U.S. Treasury securities, obligations of U.S. Government agencies and municipalities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Debt Securities | 29,072 |  | $ 28,831
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 | 6,400 |  | 11,300
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 | 5,500 |  | 7,000
Corporate Debt Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Debt Securities | $ 9,045 |  | $ 7,423

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