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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
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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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