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Schedule IV. Supplemental Schedule of Reinsurance Premiums (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]
Gross Amounts	$ 1,013,372	$ 1,105,164	$ 799,717
Ceded to Other Companies	1,614,432	1,850,807	1,863,350
Assumed	8,072,193	7,079,632	6,257,814
Net premiums earned (Note 7)	$ 7,471,133	$ 6,333,989	$ 5,194,181
Percentage of Amount Assumed to Net	108.00%	112.00%	120.00%

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