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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Premiums Written        
Direct $ 338,761 $ 259,712 $ 639,866 $ 484,851
Assumed 2,125,878 1,834,446 4,767,737 4,261,749
Ceded (601,023) (581,866) (1,378,770) (1,410,225)
Net premiums written 1,863,616 1,512,292 4,028,833 3,336,375
Premiums Earned        
Direct 278,609 188,414 521,370 350,503
Assumed 1,610,214 1,455,002 3,300,482 2,871,648
Ceded (432,440) (450,626) (879,044) (875,525)
Net premiums earned 1,456,383 1,192,790 2,942,808 2,346,626
Claims and Claim Expenses        
Gross claims and claim expenses incurred 799,218 666,106 1,816,773 1,916,352
Claims and claim expenses recovered (92,979) (146,085) (268,801) (529,280)
Net claims and claim expenses incurred $ 706,239 $ 520,021 $ 1,547,972 $ 1,387,072