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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, 2019	Mar. 31, 2018
Premiums written
Direct	$ 110,968	$ 85,167
Assumed	1,453,327	1,074,485
Ceded	(635,264)	(496,608)
Net premiums written	929,031	663,044
Premiums earned
Direct	89,814	70,032
Assumed	765,433	605,483
Ceded	(305,219)	(235,233)
Net premiums earned	550,028	440,282
Claims and claim expenses
Gross claims and claim expenses incurred	338,119	225,742
Claims and claim expenses recovered	(111,084)	(54,039)
Net claims and claim expenses incurred	$ 227,035	$ 171,703

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