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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, 2020 USD ($) Item | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2015 USD ($)
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Current year losses | $ 6,149,410 | $ 4,986,456 | $ 5,264,327 |
Increase (decrease) in insurance business | 401,427 | (63,558) | 387,076 |
Reinsurance recoverable for paid and unpaid losses | $ 1,994,555 | 1,763,471 |  |
Partially offset, related to development on reserves |  |  | 174,121 |
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 |  |  |  | $ 140,279
Liabilities retroceded, percentage |  |  |  | 100.00%
Maximum liability retroceded |  | 450,298 |  | $ 440,279
Decrease in amount of liabliities retroceded |  | 43,362 |  |
Total amount of liabilities retroceded |  |  |  | $ 300,000
Number of exposure groupings | Item | 200 |  |  |
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 | $ (120,500) | (693,458) |  |
Increase (decrease) in insurance business |  |  | $ 561,197 |
Covid-19 [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Current year losses | 511,056 |  |  |
Higher Premiums Earned [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Current year losses | 772,399 | $ 415,585 |  |
Mt Logan Re [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Reinsurance recoverable for paid and unpaid losses | $ 699,734 |  |  |
Mt Logan Re [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Concentration risk, percentage | 35.10% |  |  |
Munich Reinsurance Company [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Reinsurance recoverable for paid and unpaid losses | $ 211,594 |  |  |
Munich Reinsurance Company [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |
Concentration risk, percentage | 10.60% |  |  |

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