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Collateralized Reinsurance And Trust Agreements (Narrative) (Details) - USD ($) $ in Thousands |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 01, 2018 | Jun. 30, 2021 | Dec. 31, 2020
Effects of Reinsurance [Line Items] |  |  |
Amount on deposit in trust accounts |  | $ 1,418,185 |
Preferred shares |  |  |
Reinsurance recoverable |  | 228,727,000 | 254,907
Deferred gain liabliity |  | $ 36,064 | 38,782
Mt Logan Re [Member] |  |  |
Effects of Reinsurance [Line Items] |  |  |
Percentage of voting common shares owned by Group |  | 100.00% |
Assumed net risk exposures |  | $ 831,634 | 806,564
Net risk exposure investments |  | $ 67,881 | $ 67,645
Retrocede amount | $ 269,198 |  |
Cash transferred | 252,000 |  |
Mt Logan Re [Member] | Minimum [Member] |  |  |
Effects of Reinsurance [Line Items] |  |  |
Accident year |  | 2002 |
Mt Logan Re [Member] | Maximum [Member] |  |  |
Effects of Reinsurance [Line Items] |  |  |
Accident year |  | 2015 |
Liability retroceded | $ 319,000 |  |

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- Definition Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611 + Details
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