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Investments (Rollforward of Allowance for Credit Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]    
Beginning balance $ 4,030 $ 3,347
Change in allowance on securities with previous allowance 0 (1,300)
Recoveries of amounts previously written off (512) 0
Ending balance 3,518 2,047
Corporate securities    
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]    
Beginning balance 3,412 3,214
Change in allowance on securities with previous allowance 0 (1,300)
Recoveries of amounts previously written off (119) 0
Ending balance 3,293 1,914
Residential mortgage backed securities    
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]    
Beginning balance 0 133
Change in allowance on securities with previous allowance 0 0
Recoveries of amounts previously written off 0 0
Ending balance 0 133
Other asset backed securities    
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]    
Beginning balance 618 0
Change in allowance on securities with previous allowance 0 0
Recoveries of amounts previously written off (393) 0
Ending balance $ 225 $ 0