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Reinsurance (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]        
Percentage of ceded earned premiums to gross earned premiums 38.00% 35.00% 37.00% 37.00%
Percentage of assumed earned premiums to net earned premiums 29.00% 24.00% 26.00% 25.00%
Underwriting [Member]        
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]        
Gross losses and loss adjustment expenses $ 1,476,189 $ 1,186,691 $ 2,868,537 $ 2,337,040
Ceded losses 288,676 127,895 507,931 305,889
Program services and other fronting [Member]        
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]        
Gross losses and loss adjustment expenses 594,700 574,800 1,100,000 990,500
Ceded losses $ (594,300) $ (574,800) $ (1,091,000) $ (990,500)