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v3.20.1

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
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Mar. 31, 2020 | Mar. 31, 2019
Premiums written |  |
Direct | $ 147,692 | $ 110,968
Assumed | 1,878,029 | 1,453,327
Ceded | (755,913) | (635,264)
Net premiums written | 1,269,808 | 929,031
Premiums earned |  |
Direct | 134,229 | 89,814
Assumed | 1,149,733 | 765,433
Ceded | (370,864) | (305,219)
Net premiums earned | 913,098 | 550,028
Claims and claim expenses |  |
Gross claims and claim expenses incurred | 747,715 | 338,119
Claims and claim expenses recovered | (176,761) | (111,084)
Net claims and claim expenses incurred | $ 570,954 | $ 227,035

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