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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, 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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