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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, 2021	Mar. 31, 2020
Premiums written
Direct	$ 225,139	$ 147,692
Assumed	2,427,303	1,878,029
Ceded	(828,359)	(755,913)
Net premiums written	1,824,083	1,269,808
Premiums earned
Direct	162,089	134,229
Assumed	1,416,646	1,149,733
Ceded	(424,899)	(370,864)
Net premiums earned	1,153,836	913,098
Claims and claim expenses
Gross claims and claim expenses incurred	1,250,246	747,715
Claims and claim expenses recovered	(383,195)	(176,761)
Net claims and claim expenses incurred	$ 867,051	$ 570,954

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