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Investments - Net Realized and Unrealized Investment Gains and Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Net realized and unrealized investment gains and losses |  |  |
Gains on sales of fixed maturity securities | $ 14 | $ 466 | $ 501
Gains on sales of equity securities |  | 1,416 | 62
Total realized gains | 14 | 1,882 | 563
Losses on sales of fixed maturity securities | (2,340) | (1) | (46)
Losses on sales of equity securities |  |  | (68)
Total realized losses | (2,340) | (1) | (114)
Net realized investment gains | (2,326) | 1,881 | 449
Net unrealized gains (losses) on equity securities | (5,203) | (604) | 1,039
Net realized and unrealized gains (losses) on investments | (7,529) | 1,277 | 1,488
Proceeds from sales of fixed maturity securities |  |  |
Proceeds from the sale of fixed maturity securities | $ 19,700 | $ 17,400 | $ 39,800

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