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Reserve for Claims and Claim Expenses (Prior Year Development of the Reserve for Net Claims and Claim Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years | $ (147,650) | $ (53,877) | $ (208,711) | $ (55,383)
Change In Actuarial Assumption |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  |  | 5,445
Property |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (202,080) | (31,556)
Property | Large and Small Catastrophe Events and Attritional Loss Movements |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (202,080) | (37,001)
Property | Large catastrophe events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (160,586) | (23,577)
Property | 2020 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 16,939 |
Property | 2019 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (40,582) | (13,435)
Property | 2018 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (99,337) | (12,306)
Property | 2017 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (38,220) | (9,101)
Property | Other |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 614 | 11,265
Property | Small catastrophe events and attritional loss movements |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (41,494) | (13,424)
Property | Other small catastrophe events and attritional loss movements |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (41,494) | (13,424)
Property | Operating Segments |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years | (145,935) | (38,849) | (202,080) | (31,556)
Casualty and Specialty |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (6,631) | (23,827)
Casualty and Specialty | Actuarial methods - actual reported claims less than expected claims |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (9,612) | (27,944)
Casualty and Specialty | Change In Actuarial Assumption |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 2,981 | 4,117
Casualty and Specialty | Operating Segments |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years | $ (1,715) | $ (15,028) | $ (6,631) | $ (23,827)

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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