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Reserve For Losses, LAE And Future Policy Benefit Reserve (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) Item | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2015 USD ($)
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Current year losses | $ 7,400,303 | $ 6,149,410 | $ 4,986,456 |
Prior year losses | (9,050) | 401,427 | $ (63,558) |
Reinsurance recoverable for paid and unpaid losses | $ 2,100,000 | 2,000,000 |  |
Contracts of insurance and reinsurance received claims during the past three years, in years | 20 years |  |  |
Business acquisition, cost of acquired entity and operations, cash paid |  |  |  | $ 140,300
Liabilities retroceded, percentage |  |  |  | 100.00%
Maximum liability retroceded |  | 450,300 |  | $ 440,300
Decrease in amount of liabilities retroceded |  | 43,400 |  |
Total amount of liabilities retroceded |  |  |  | $ 300,000
Number of exposure groupings | Item | 200 |  |  |
Other Retrocessionaire [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Concentration risk, percentage | 5.00% |  |  |
Catastrophe Losses [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Current year losses | $ 710,000 | (120,500) |  |
Covid-19 [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Current year losses |  | 511,100 |  |
Higher Premiums Earned [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Current year losses | 540,900 | $ 772,400 |  |
Mt Logan Re [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Reinsurance recoverable for paid and unpaid losses | $ 691,400 |  |  |
Mt Logan Re [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Concentration risk, percentage | 33.70% |  |  |
Munich Reinsurance Company [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Reinsurance recoverable for paid and unpaid losses | $ 221,900 |  |  |
Munich Reinsurance Company [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Concentration risk, percentage | 10.80% |  |  |
Endurance Re [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Reinsurance recoverable for paid and unpaid losses | $ 115,100 |  |  |
Endurance Re [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Concentration risk, percentage | 5.60% |  |  |

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