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Segment Reporting Disclosures (Summary of Gross Premium Volume and Net Written Premiums) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of GWP and NWP, by Segment [Line Items]      
Gross written premiums $ 14,002,237 $ 13,201,682 $ 11,438,682
Net written premiums 8,397,575 8,203,390 7,119,731
Underwriting Operations [Member]      
Schedule of GWP and NWP, by Segment [Line Items]      
Gross written premiums 10,277,632 9,847,538 8,485,929
Net written premiums 8,398,788 8,207,373 7,125,166
Insurance [Member]      
Schedule of GWP and NWP, by Segment [Line Items]      
Gross written premiums 9,217,150 8,606,700 7,239,676
Net written premiums 7,432,062 7,040,176 5,998,890
Reinsurance [Member]      
Schedule of GWP and NWP, by Segment [Line Items]      
Gross written premiums 1,046,539 1,229,851 1,246,143
Net written premiums 967,799 1,167,312 1,126,167
Other underwriting [Member]      
Schedule of GWP and NWP, by Segment [Line Items]      
Gross written premiums 13,943 10,987 110
Net written premiums (1,073) (115) 109
Program services and other fronting [Member]      
Schedule of GWP and NWP, by Segment [Line Items]      
Gross written premiums 3,724,605 3,354,144 2,952,753
Net written premiums $ (1,213) $ (3,983) $ (5,435)