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Reinsurance (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]        
Percentage of ceded earned premiums to gross earned premiums 40.00% 40.00% 38.00% 38.00%
Percentage of assumed earned premiums to net earned premiums 35.00% 32.00% 29.00% 28.00%
Underwriting [Member]        
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]        
Gross losses and loss adjustment expenses $ 1,684,389 $ 1,423,526 $ 4,552,926 $ 3,760,566
Ceded losses 278,945 238,220 786,876 544,109
Program services and other fronting [Member]        
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]        
Gross losses and loss adjustment expenses 743,800 1,300,000 1,800,000 2,300,000
Ceded losses $ (744,900) $ (1,330,700) $ (1,835,900) $ (2,321,200)