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Related Party Transactions and Major Customers (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Related Party Transaction [Line Items]      
Gross premiums written (Note 7) $ 8,862,366 $ 9,213,540 $ 7,833,798
Gross premiums earned 8,072,193 7,079,632 6,257,814
Acquisition expenses 1,875,034 1,568,606 1,214,858
Net reinsurance costs and recoveries (376,853) (1,512,300) (2,029,529)
Total reserve for claims and claim expenses 20,486,869 15,892,573 13,294,630
Equity method investment, dividends and distributions $ 41,400 $ 24,200 $ 33,900
Gross premiums written | Three Brokers | Customer Concentration Risk      
Related Party Transaction [Line Items]      
Percent of gross premiums received 84.30% 82.20% 78.00%
Gross premiums written | Aon plc | Customer Concentration Risk      
Related Party Transaction [Line Items]      
Percent of gross premiums received 36.10% 35.40% 35.80%
Gross premiums written | Marsh & McLennan Companies, Inc. | Customer Concentration Risk      
Related Party Transaction [Line Items]      
Percent of gross premiums received 33.20% 33.30% 30.00%
Gross premiums written | Arthur J Gallagher | Customer Concentration Risk      
Related Party Transaction [Line Items]      
Percent of gross premiums received 15.00% 13.50% 12.20%
Related Party | Tower Hill Companies      
Related Party Transaction [Line Items]      
Gross premiums written (Note 7) $ 96,800 $ 82,000 $ 69,800
Gross premiums earned 83,300 80,000 63,000
Acquisition expenses 12,700 15,800 11,300
Outstanding receivable 37,000 19,100  
Net reinsurance costs and recoveries (9,800) 68,600 28,500
Total reserve for claims and claim expenses 50,200 89,800  
Equity method investment, dividends and distributions 22,600 10,500 15,000
Related Party | Top Layer Reinsurance Ltd.      
Related Party Transaction [Line Items]      
Equity method investment, dividends and distributions 7,800 8,700 9,300
Related Party | Management Fee | Top Layer Reinsurance Ltd.      
Related Party Transaction [Line Items]      
Revenue recorded $ 3,400 $ 2,400 $ 2,500