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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

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