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Reserve For Losses, LAE And Future Policy Benefit Reserve (Narrative) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) Item | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2015 USD ($) | Dec. 20, 2019 USD ($)
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Current year losses | $ 4,986,456 | $ 5,264,327 | $ 4,815,967 |  |
Increase (decrease) in insurance business | (63,558) | 387,076 | (293,386) |  |
Reinsurance recoverable for paid and unpaid losses | 1,763,471 | 1,787,648 |  |  |
Partially offset, related to development on reserves | $ 415,585 | 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 |
Liabilites retroceded, percentage |  |  |  | 100.00% |
Maximum liability retroceded |  |  |  | $ 440,279 | $ 450,298
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% |  |  |  |
Property and Short-Tail Business [Member] |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Increase (decrease) in reinsurance business |  |  | (238,378) |  |
Catastrophe Losses [Member] |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Increase (decrease) in insurance business | $ (693,458) | $ 561,197 |  |  |
Workers Compensation [Member] |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Increase (decrease) in insurance business |  |  | 55,007 |  |
Mt Logan Re [Member] |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Reinsurance recoverable for paid and unpaid losses | $ 682,845 |  |  |  |
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 | 38.70% |  |  |  |
Zurich Vericherungs Gesellschaft [Member] |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Reinsurance recoverable for paid and unpaid losses | $ 95,481 |  |  |  |
Zurich Vericherungs Gesellschaft [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 | 5.40% |  |  |  |
Munich Reinsurance Company [Member] |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Reinsurance recoverable for paid and unpaid losses | $ 147,807 |  |  |  |
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 | 8.40% |  |  |  |
A And E [Member] |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Partially offset, related to development on reserves |  |  | $ 37,137 |  |

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