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Schedule IV - Reinsurance (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]                      
Gross Amount                 $ 3,028,095 $ 2,551,662 $ 2,129,320
Ceded to Other Companies                 1,401,262 1,207,198 1,004,953
Assumed from Other Companies                 7,054,680 6,059,222 5,807,332
Net Amount $ 2,396,483 $ 2,205,811 $ 2,042,405 $ 2,036,814 $ 1,948,071 $ 1,905,619 $ 1,817,299 $ 1,732,697 8,681,513 7,403,686 6,931,699
Total Property And Liability Insurance Premiums Earned [Member]                      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]                      
Gross Amount                 3,028,095 2,556,386 2,129,320
Ceded to Other Companies                 1,401,262 1,207,198 1,004,953
Assumed from Other Companies                 7,054,680 6,054,498 5,807,332
Net Amount                 $ 8,681,513 $ 7,403,686 $ 6,931,699
Assumed to Net 81.30%       81.80%       81.30% 81.80% 83.80%