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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 | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Premiums Written |  |  |
Direct | $ 994,286 | $ 612,172 | $ 461,409
Assumed | 6,839,512 | 5,193,993 | 4,346,341
Ceded | (1,894,423) | (1,709,832) | (1,426,257)
Net premiums written | 5,939,375 | 4,096,333 | 3,381,493
Premiums Earned |  |  |
Direct | 799,717 | 536,595 | 404,525
Assumed | 6,257,814 | 5,078,682 | 4,348,261
Ceded | (1,863,350) | (1,662,815) | (1,414,383)
Net premiums earned (Note 7) | 5,194,181 | 3,952,462 | 3,338,403
Claims and Claim Expenses |  |  |
Gross claims and claim expenses incurred | 5,905,616 | 3,893,204 | 3,221,778
Claims and claim expenses recovered | (2,029,529) | (968,595) | (1,124,757)
Net claims and claim expenses incurred | $ 3,876,087 | $ 2,924,609 | $ 2,097,021

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