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Investments - Net Gains (Losses) on Investments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Gain (Loss) on Securities [Line Items]        
Net realized gains (losses) on investments sold or redeemed $ (2,874) $ (4,139) $ (11,730) $ (8,454)
Mortgage loans held for sale (99) 0 (94) 0
Change in unrealized gains (losses) on investments sold or redeemed 9 29 226 (2,914)
Net unrealized gains (losses) on investments still held (7,018) (14,803) (1,385) (60,631)
Mortgage loans held for sale (1,675) 0 (1,785) 0
Total net gains (losses) on investments (9,883) (18,913) (12,889) (71,999)
Net gains (losses) on other financial instruments 1,328 2,661 9,683 (15,579)
Net gains (losses) on investments and other financial instruments (8,555) (16,252) (3,206) (87,578)
Fixed-maturities available for sale        
Gain (Loss) on Securities [Line Items]        
Gross realized gains 20 411 588 2,554
Gross realized losses (2,814) (4,564) (13,768) (12,625)
Fixed-maturities available for sale, net (2,794) (4,153) (13,180) (10,071)
Trading securities        
Gain (Loss) on Securities [Line Items]        
Net realized gains (losses) on investments sold or redeemed 0 (30) (402) (136)
Net unrealized gains (losses) on investments still held (5,632) (7,398) (4,494) (27,892)
Equity securities        
Gain (Loss) on Securities [Line Items]        
Net realized gains (losses) on investments sold or redeemed 0 0 1,890 1,655
Net unrealized gains (losses) on investments still held 290 (7,256) 4,991 (32,249)
Other investments        
Gain (Loss) on Securities [Line Items]        
Net realized gains (losses) on investments sold or redeemed 19 44 56 98
Net unrealized gains (losses) on investments still held $ (1) $ (149) $ (97) $ (490)