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Related Party Transactions and Major Customers (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |
Gross premiums written (Note 7) | $ 7,833,798 | $ 5,806,165 | $ 4,807,750
Gross premiums earned | 6,257,814 | 5,078,682 | 4,348,261
Acquisition expenses | 1,214,858 | 897,677 | 762,232
Net reinsurance costs and recoveries | (2,029,529) | (968,595) | (1,124,757)
Total reserve for claims and claim expenses | 13,294,630 | 10,381,138 | 9,384,349
Equity method investment, dividends and distributions | $ 33,900 | $ 30,000 | $ 36,500
Gross premiums written | Three Brokers | Customer Concentration Risk |  |  |
Related Party Transaction [Line Items] |  |  |
Percent of gross premiums received | 78.00% | 79.60% | 79.60%
Gross premiums written | Aon plc | Customer Concentration Risk |  |  |
Related Party Transaction [Line Items] |  |  |
Percent of gross premiums received | 35.80% | 42.80% | 41.70%
Gross premiums written | Marsh & McLennan Companies, Inc. | Customer Concentration Risk |  |  |
Related Party Transaction [Line Items] |  |  |
Percent of gross premiums received | 30.00% | 24.50% | 27.10%
Gross premiums written | Arthur J Gallagher | Customer Concentration Risk |  |  |
Related Party Transaction [Line Items] |  |  |
Percent of gross premiums received | 12.20% | 12.30% | 10.80%
Tower Hill Companies |  |  |
Related Party Transaction [Line Items] |  |  |
Gross premiums written (Note 7) | $ 69,800 | $ 55,500 | $ 39,800
Gross premiums earned | 63,000 | 51,400 | 40,700
Acquisition expenses | 11,300 | 7,900 | 6,100
Related party receivables | 21,700 | 18,300 |
Net reinsurance costs and recoveries | 28,500 | 13,200 | 37,700
Total reserve for claims and claim expenses | 68,000 | 69,500 |
Equity method investment, dividends and distributions | 15,000 | 9,500 | 13,400
Top Layer Reinsurance Ltd. |  |  |
Related Party Transaction [Line Items] |  |  |
Equity method investment, dividends and distributions | 9,300 | 18,000 | 20,000
Top Layer Reinsurance Ltd. | Management Fee |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue recorded | $ 2,500 | $ 2,400 | $ 2,300

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