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Reserve for Loss and Loss Expense (Insurance Subsidiaries) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]      
Prior year development $ (9,954) $ (78,890) $ (82,853)
Favorable or unfavorable loss development [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Prior year development (10,000) (78,900) (82,900)
Favorable or unfavorable loss development [Member] | Casualty Insurance Product Line [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Prior year development (6,500) (86,000) (81,000)
Favorable or unfavorable loss development [Member] | Property Insurance [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Prior year development $ (16,500) (7,100) (1,900)
Favorable or unfavorable loss development [Member] | E&S Lines [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Prior year development     (7,000)
Favorable or unfavorable loss development [Member] | Commercial Automobile [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Prior year development   (22,500) (13,300)
Favorable or unfavorable loss development [Member] | Commercial Automobile [Member] | Casualty Insurance Product Line [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Prior year development   $ (15,000) $ (15,000)