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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

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