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Schedule IV - Reinsurance (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]                      
Gross Amount                 $ 2,551,662 $ 2,129,320 $ 1,825,705
Ceded to Other Companies                 1,207,198 1,004,953 833,387
Assumed from Other Companies                 6,059,222 5,807,332 4,945,522
Net Amount $ 1,948,071 $ 1,905,619 $ 1,817,299 $ 1,732,697 $ 1,850,975 $ 1,731,479 $ 1,729,818 $ 1,619,427 7,403,686 6,931,699 5,937,840
Total Property And Liability Insurance Premiums Earned [Member]                      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]                      
Gross Amount                 2,556,386 2,129,320 1,825,705
Ceded to Other Companies                 1,207,198 1,004,953 833,387
Assumed from Other Companies                 6,054,498 5,807,332 4,945,522
Net Amount                 $ 7,403,686 $ 6,931,699 $ 5,937,840
Assumed to Net 81.80%       83.80%       81.80% 83.80% 83.30%