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Investments (Net Realized Investment Gains (Losses)) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Debt Securities, Available-for-Sale [Line Items]    
Total impairment losses: $ (1,510,000) $ (2,933,000)
Corporate debt 576,000 0
Net impairment losses recognized in earnings (934,000) (2,933,000)
Gross realized gains, available-for-sale fixed maturities 366,000 79,000
Gross realized (losses), available-for-sale fixed maturities (1,099,000) (457,000)
Net realized gains (losses), trading fixed maturities 15,000 (108,000)
Net realized gains (losses), equity investments (256,000) 84,000
Net realized gains (losses), other investments 1,776,000 229,000
Change in unrealized holding gains (losses), trading fixed maturities 214,000 97,000
Change in unrealized holding gains (losses), equity investments 774,000 3,746,000
Change in unrealized holding gains (losses), convertible securities, carried at fair value (1,119,000) 1,132,000
Other (5,000) 1,043,000
Total net investment gains (losses) (268,000) 2,912,000
NORCAL Group    
Debt Securities, Available-for-Sale [Line Items]    
Gain on fair value of contingent consideration   1,000,000
Corporate Debt    
Debt Securities, Available-for-Sale [Line Items]    
Total impairment losses: (1,316,000) (2,936,000)
Asset-backed securities    
Debt Securities, Available-for-Sale [Line Items]    
Total impairment losses: $ (194,000) $ 3,000