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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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