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Related Party Transactions and Major Customers (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
Related Party Transaction [Line Items]                      
Gross premiums written (Note 7) $ 935,514 $ 1,143,058 $ 1,701,872 $ 2,025,721 $ 905,479 $ 861,068 $ 1,476,908 $ 1,564,295 $ 5,806,165 $ 4,807,750 $ 3,310,427
Gross premiums earned                 5,078,682 4,348,261 2,779,796
Acquisition expenses 238,283 $ 215,180 $ 233,610 $ 210,604 208,618 $ 202,181 $ 227,482 $ 123,951 897,677 762,232 432,989
Net reinsurance costs and recoveries                 (968,595) (1,124,757) (1,458,518)
Total reserve for claims and claim expenses 10,381,138       9,384,349       10,381,138 9,384,349 6,076,271
Equity method investment, dividends and distributions                 $ 30,000 $ 36,500 $ 26,100
Gross premiums written | Three Brokers                      
Related Party Transaction [Line Items]                      
Percent of gross premiums received                 79.60% 79.60% 75.20%
Gross premiums written | Aon plc                      
Related Party Transaction [Line Items]                      
Percent of gross premiums received                 42.80% 41.70% 40.70%
Gross premiums written | Marsh Inc.                      
Related Party Transaction [Line Items]                      
Percent of gross premiums received                 24.50% 27.10% 24.60%
Gross premiums written | Willis Towers Watson Public Limited Company                      
Related Party Transaction [Line Items]                      
Percent of gross premiums received                 12.30% 10.80% 9.90%
Tower Hill Companies                      
Related Party Transaction [Line Items]                      
Gross premiums written (Note 7)                 $ 55,500 $ 39,800 $ 45,500
Gross premiums earned                 51,400 40,700 43,800
Acquisition expenses                 7,900 6,100 7,100
Related party receivables 18,300       14,800       18,300 14,800  
Net reinsurance costs and recoveries                 13,200 37,700 111,200
Total reserve for claims and claim expenses $ 69,500       $ 71,800       69,500 71,800  
Equity method investment, dividends and distributions                 9,500 13,400 12,100
Top Layer Reinsurance Ltd.                      
Related Party Transaction [Line Items]                      
Equity method investment, dividends and distributions                 18,000 20,000 12,500
Top Layer Reinsurance Ltd. | Management Fee                      
Related Party Transaction [Line Items]                      
Revenue recorded                 $ 2,400 $ 2,300 $ 2,700