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Reinsurance (Effect of Reinsurance and Retrocessional Activity on Premiums Written and Earned and on Net Claims and Claim Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Premiums Written
Direct	$ 301,105	$ 225,139
Assumed	2,641,859	2,427,303
Ceded	(777,747)	(828,359)
Net premiums written	2,165,217	1,824,083
Premiums Earned
Direct	242,761	162,089
Assumed	1,690,268	1,416,646
Ceded	(446,604)	(424,899)
Net premiums earned	1,486,425	1,153,836
Claims and Claim Expenses
Gross claims and claim expenses incurred	1,017,555	1,250,246
Claims and claim expenses recovered	(175,822)	(383,195)
Net claims and claim expenses incurred	$ 841,733	$ 867,051

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