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Investments - Net Gains (Losses) on Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains (losses) on investments sold or redeemed | $ (4,139) | $ 14,246 | $ (8,454) | $ 18,330
Change in unrealized gains (losses) on investments sold or redeemed | 29 | (7,584) | (2,914) | (7,115)
Net decrease (increase) in expected credit losses | 0 | 0 | 0 | 918
Net unrealized gains (losses) on investments still held | (14,803) | (3,758) | (60,631) | 1,290
Total net gains (losses) on investments | (18,913) | 2,904 | (71,999) | 13,423
Net gains (losses) on other financial instruments | 2,661 | (806) | (15,579) | (845)
Net gains (losses) on investments and other financial instruments | (16,252) | 2,098 | (87,578) | 12,578
Fixed-maturities available for sale |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains | 411 | 5,874 | 2,554 | 19,588
Gross realized losses | (4,564) | (1,776) | (12,625) | (13,904)
Fixed-maturities available for sale, net | (4,153) | 4,098 | (10,071) | 5,684
Trading securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains (losses) on investments sold or redeemed | (30) | 0 | (136) | 391
Net unrealized gains (losses) on investments still held | (7,398) | (2,659) | (27,892) | (6,011)
Equity securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains (losses) on investments sold or redeemed | 0 | 8,632 | 1,655 | 8,405
Net unrealized gains (losses) on investments still held | (7,256) | (1,086) | (32,249) | 6,251
Other investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains (losses) on investments sold or redeemed | 44 | 1,516 | 98 | 3,850
Net unrealized gains (losses) on investments still held | $ (149) | $ (13) | $ (490) | $ 1,050

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