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Investments (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
securities
Dec. 31, 2022
USD ($)
securities
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity securities in unrealized loss position, number of positions | securities 1,386 1,400
Available-for-sale fixed maturity securities in unrealized loss position, number of positions, 12 months or longer | securities 1,131 246
Available-for-sale fixed maturity securities, estimated fair value $ 9,982,329 $ 11,280,896
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 661,282 962,210
Available-for-sale fixed maturity securities, estimated fair value, 12 months or longer 8,515,061 3,356,273
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 650,461 $ 393,911
Estimated average duration of fixed maturities 4 years 1 month 6 days  
Percentage threshold of shareholders' equity used to define concentration of investments 10.00% 10.00%
Investments, Available-for-sale, Allowance for Credit Loss $ 0 $ 0
Fixed maturities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity securities, estimated fair value 9,929,728 10,506,416
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 660,889 962,152
Available-for-sale fixed maturity securities, estimated fair value, 12 months or longer 8,515,061 3,356,273
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 650,461 $ 393,911