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Investments - Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Debt and Equity Securities, Gain (Loss) |  |  |  |
Gross realized gains | $ 5,798 | $ 27,432 | $ 6,519 | $ 28,975
Gross realized losses | (261) | (2,464) | (603) | (4,016)
Net realized gains (losses) | 5,537 | 24,968 | 5,916 | 24,959
Fair Value at Sale |  |  |  |
Fair value at sale | 75,279 | 146,153 | 201,334 | 242,651
Fair value at sale | 40,116 | 10,712 | 80,240 | 20,949
Net fair value at sale | 115,395 | 156,865 | 281,574 | 263,600
Fixed Maturities |  |  |  |
Debt and Equity Securities, Gain (Loss) |  |  |  |
Gross realized gains | 293 | 708 | 1,012 | 1,425
Gross realized losses | (236) | (45) | (544) | (439)
Fair Value at Sale |  |  |  |
Fair value at sale | 50,112 | 47,153 | 161,314 | 139,609
Fair value at sale | 16,086 | 1,203 | 47,707 | 7,942
Equity Securities |  |  |  |
Debt and Equity Securities, Gain (Loss) |  |  |  |
Gross realized gains | 5,505 | 26,724 | 5,507 | 27,550
Gross realized losses | 0 | (2,419) | (18) | (3,577)
Fair Value at Sale |  |  |  |
Fair value at sale | 10,512 | 97,725 | 10,535 | 101,696
Fair value at sale | 56 | 9,509 | 575 | 12,879
Short-term Investments |  |  |  |
Debt and Equity Securities, Gain (Loss) |  |  |  |
Gross realized gains | 0 | 0 | 0 | 0
Gross realized losses | (25) | 0 | (41) | 0
Fair Value at Sale |  |  |  |
Fair value at sale | 14,655 | 1,275 | 29,485 | 1,346
Fair value at sale | $ 23,974 | $ 0 | $ 31,958 | $ 128

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