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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years | $ (52,029) | $ (15,406) | $ (61,061) | $ (1,506)
Property |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (56,145) | 7,293
Property | Actuarial methods - actual reported claims less than expected claims |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  |  | 43,400
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 |  |  | (56,145) |
Property | Large catastrophe events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (31,103) | (29,067)
Property | 2020 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 16,932 |
Property | 2019 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (1,424) | (19,940)
Property | 2018 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (37,910) | (12,306)
Property | 2017 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (5,708) | (3,825)
Property | Other |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (2,993) | 7,004
Property | Small catastrophe events and attritional loss movements |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (25,042) | 36,360
Property | Other small catastrophe events and attritional loss movements |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (25,042) | 36,360
Property | Operating Segments |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years | (50,983) | (6,608) | (56,145) | 7,293
Casualty and Specialty |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (4,916) | (8,799)
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 |  |  | (4,916) | (8,799)
Casualty and Specialty | Operating Segments |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years | $ (1,046) | $ (8,798) | $ (4,916) | $ (8,799)

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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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