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Reinsurance (Tables) | 12 Months Ended
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Dec. 31, 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract] |
Schedule of Effect of Reinsurance and Retrocessional Activity on Premiums Written and Earned and on Net Claims and Claim Expenses Incurred | The following table sets forth the effect of reinsurance and retrocessional activity on premiums written and earned and on net claims and claim expenses incurred:
| Year ended December 31, | 2020 |  | 2019 |  | 2018 |
| Premiums Written |  |  |  |  |  |
| Direct | $ | 612,172 |  |  | $ | 461,409 |  |  | $ | 337,587 |  |
| Assumed | 5,193,993 |  |  | 4,346,341 |  |  | 2,972,840 |  |
| Ceded | (1,709,832) |  |  | (1,426,257) |  |  | (1,178,525) |  |
| Net premiums written | $ | 4,096,333 |  |  | $ | 3,381,493 |  |  | $ | 2,131,902 |  |
| Premiums Earned |  |  |  |  |  |
| Direct | $ | 536,595 |  |  | $ | 404,525 |  |  | $ | 292,219 |  |
| Assumed | 5,078,682 |  |  | 4,348,261 |  |  | 2,779,796 |  |
| Ceded | (1,662,815) |  |  | (1,414,383) |  |  | (1,095,886) |  |
| Net premiums earned | $ | 3,952,462 |  |  | $ | 3,338,403 |  |  | $ | 1,976,129 |  |
| Claims and Claim Expenses |  |  |  |  |  |
| Gross claims and claim expenses incurred | $ | 3,893,204 |  |  | $ | 3,221,778 |  |  | $ | 2,578,536 |  |
| Claims and claim expenses recovered | (968,595) |  |  | (1,124,757) |  |  | (1,458,518) |  |
| Net claims and claim expenses incurred | $ | 2,924,609 |  |  | $ | 2,097,021 |  |  | $ | 1,120,018 |  |
Schedule of Activity in the Allowance Recorded Against Premium Receivables | The following table provides a roll forward of the provision for current expected credit losses of the Company’s premiums receivable:
| Year ended December 31, | 2020 |
| Beginning balance | $ | 2,096 |  |
| Provision for allowance | 3,865 |  |
| Ending balance | $ | 5,961 |  |
Schedule of Activity in the Allowance Recorded Against Reinsurance Recoverables | The following table provides a roll forward of the provision for current expected credit losses of the Company’s reinsurance recoverable:
| Year ended December 31, | 2020 |
| Beginning balance | $ | 7,265 |  |
| Provision for allowance | (931) |  |
| Ending balance | $ | 6,334 |  |

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- Definition Tabular disclosure of allowance for credit loss on premium receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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