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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
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Mar. 31, 2022 | Mar. 31, 2021
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | $ (17,833) | $ (9,032)
Property |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (16,758) | (5,162)
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 | (16,758) | (5,162)
Property | Large catastrophe events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (14,290) | (14,192)
Property | 2021 Weather-Related Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | 19,190 |
Property | 2020 Weather-Related Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (5,272) |
Property | 2019 Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (4,807) | (4,742)
Property | 2018 Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (3,800) | (3,263)
Property | 2017 Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (18,000) | (5,508)
Property | Other |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (1,601) | (679)
Property | Small catastrophe events and attritional loss movements |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (2,468) | 9,030
Property | Other small catastrophe events and attritional loss movements |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (2,468) | 9,030
Property | Operating Segments |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (16,758) | (5,162)
Casualty and Specialty |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (1,075) | (3,870)
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 | (1,075) | (3,870)
Casualty and Specialty | Operating Segments |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | $ (1,075) | $ (3,870)

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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