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Investments - Net Gains (Losses) on Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains (losses) on investments sold or redeemed | $ (3,992) | $ 4,266 | $ (4,315) | $ 4,084
Change in unrealized gains (losses) on investments sold or redeemed | (28) | (1,883) | (2,198) | (2,080)
Net decrease (increase) in expected credit losses | 0 | 608 | 0 | 918
Net unrealized gains (losses) on investments still held | (29,113) | 9,919 | (46,573) | 7,597
Total net gains (losses) on investments | (33,133) | 12,910 | (53,086) | 10,519
Net gains (losses) on other financial instruments | (8,736) | 2,751 | (18,240) | (39)
Net gains (losses) on investments and other financial instruments | (41,869) | 15,661 | (71,326) | 10,480
Fixed-maturities available for sale |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains | 713 | 9,597 | 2,143 | 13,714
Gross realized losses | (4,653) | (7,221) | (8,061) | (12,128)
Fixed-maturities available for sale, net | (3,940) | 2,376 | (5,918) | 1,586
Trading securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains (losses) on investments sold or redeemed | (106) | (112) | (106) | 391
Net unrealized gains (losses) on investments still held | (8,221) | 4,601 | (21,138) | (3,448)
Equity securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains (losses) on investments sold or redeemed | 0 | (227) | 1,655 | (227)
Net unrealized gains (losses) on investments still held | (20,707) | 5,140 | (25,014) | 9,983
Other investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains (losses) on investments sold or redeemed | 54 | 2,229 | 54 | 2,334
Net unrealized gains (losses) on investments still held | $ (185) | $ 178 | $ (421) | $ 1,062

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