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Investments (Available-for-sale allowance for credit losses roll forward) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]    
Allowance for credit losses, beginning balance $ 45,721 $ 9,724
Current provision for securities without prior allowance 4,142 34,561
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0 8,318
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (17,040) 4,608
Reduction for securities sold (4,340) (7,636)
Reduction for securities identified as intent (or requirement) to sell during the period (271) (3,854)
Allowance for credit losses, ending balance 28,212 45,721
Foreign Government [Member]    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]    
Allowance for credit losses, beginning balance 284 46
Current provision for securities without prior allowance 0 291
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0 0
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (249) 4
Reduction for securities sold 0 (57)
Reduction for securities identified as intent (or requirement) to sell during the period 0 0
Allowance for credit losses, ending balance 35 284
Obligations of States and Political Subdivisions [Member]    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]    
Allowance for credit losses, beginning balance 1,024 137
Current provision for securities without prior allowance 48 1,087
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0 0
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (281) (6)
Reduction for securities sold (122) (194)
Reduction for securities identified as intent (or requirement) to sell during the period 0 0
Allowance for credit losses, ending balance 669 1,024
Corporate Securities [Member]    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]    
Allowance for credit losses, beginning balance 30,330 6,682
Current provision for securities without prior allowance 3,457 30,670
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0 0
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (16,879) 3,714
Reduction for securities sold (3,638) (6,902)
Reduction for securities identified as intent (or requirement) to sell during the period (271) (3,834)
Allowance for credit losses, ending balance 12,999 30,330
Collateralized Loan Obligations and Other Asset-Backed Securities [Member]    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]    
Allowance for credit losses, beginning balance 2,375 939
Current provision for securities without prior allowance 619 2,158
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0 0
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (116) (652)
Reduction for securities sold (24) (50)
Reduction for securities identified as intent (or requirement) to sell during the period 0 (20)
Allowance for credit losses, ending balance 2,854 2,375
Residential Mortgage Backed Securities [Member]    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]    
Allowance for credit losses, beginning balance 11,597 1,909
Current provision for securities without prior allowance 17 245
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0 8,318
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 447 1,558
Reduction for securities sold (412) (433)
Reduction for securities identified as intent (or requirement) to sell during the period 0 0
Allowance for credit losses, ending balance 11,649 11,597
Commercial Mortgage Backed Securities [Member]    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]    
Allowance for credit losses, beginning balance 111 11
Current provision for securities without prior allowance 1 110
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0 0
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 38 (10)
Reduction for securities sold (144) 0
Reduction for securities identified as intent (or requirement) to sell during the period 0 0
Allowance for credit losses, ending balance $ 6 $ 111