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Schedule IV - Reinsurance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Gross Amount $ 3,588,926 $ 3,028,095 $ 2,551,662
Ceded to Other Companies 1,497,557 1,401,262 1,207,198
Assumed from Other Companies 8,315,072 7,054,680 6,059,222
Net Amount 10,406,441 8,681,513 7,403,686
Total Property And Liability Insurance Premiums Earned [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Gross Amount 3,588,926 3,028,095 2,556,386
Ceded to Other Companies 1,497,557 1,401,262 1,207,198
Assumed from Other Companies 8,315,072 7,054,680 6,054,498
Net Amount $ 10,406,441 $ 8,681,513 $ 7,403,686
Assumed to Net 79.90% 81.30% 81.80%