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REINSURANCE - Schedule of Effect of Reinsurance and Retrocessional Activity on Premiums Written and Earned and on Net Claims and Claim Expenses Incurred (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Premiums Written |  |
Direct | $ 320,657 | $ 172,696
Assumed | 3,670,027 | 2,617,565
Ceded | (791,111) | (526,558)
Net premiums written | 3,199,573 | 2,263,703
Premiums Earned |  |
Direct | 279,742 | 254,019
Assumed | 2,597,198 | 1,843,669
Ceded | (433,030) | (417,138)
Net premiums earned | 2,443,910 | 1,680,550
Claims and Claim Expenses |  |
Gross claims and claim expenses incurred | 1,159,623 | 959,704
Claims and claim expenses recovered | 6,500 | (158,504)
Net claims and claim expenses incurred | $ 1,166,123 | $ 801,200

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