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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years | $ (53,877) | $ (10,447) | $ (55,383) | $ (14,520)
Change In Actuarial Assumption |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  |  | 9,245
Other |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years | 20 | 161 | (131) | 178
Property |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (31,425) | 5,020
Property | Change In Actuarial Assumption |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 5,445 | 9,200
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 |  |  | (36,870) | (4,225)
Property | Large catastrophe events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (23,577) | (5,391)
Property | 2019 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (13,435) |
Property | 2018 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (12,306) | 61,592
Property | 2017 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (9,101) | (90,817)
Property | Other |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 11,265 | 23,834
Property | Small catastrophe events and attritional loss movements |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (13,293) | 1,166
Property | Other small catastrophe events and attritional loss movements |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (13,293) | 1,166
Property | Operating Segments |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years | (38,869) | (7,620) | (31,425) | 5,020
Casualty and Specialty |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (23,827) | (19,718)
Casualty and Specialty | Actuarial methods |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (27,944) | (54,527)
Casualty and Specialty | Change In Actuarial Assumption |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 4,117 | 34,809
Casualty and Specialty | Operating Segments |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years | $ (15,028) | $ (2,988) | $ (23,827) | $ (19,718)

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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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