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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 | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | $ (249,470) | $ (183,812) | $ (26,855)
Actuarial assumption changes |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years |  | 5,445 |
Other |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | 0 | 0 | 0
Property |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (233,373) | (157,049) | (2,973)
Property | Actuarial assumption changes |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | 5,450 | 5,400 | 9,245
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 | (238,823) | (162,494) | (12,218)
Property | Large catastrophe events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (204,072) | (120,905) | (17,557)
Property | 2020 Weather-Related Large Loss Events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | 17,140 |  |
Property | 2019 Large Loss Events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (61,634) | (44,389) |
Property | 2018 Large Loss Events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (101,096) | (43,991) | 81,555
Property | 2017 Large Loss Events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (49,090) | (32,649) | (101,572)
Property | Other |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (9,392) | 124 | (31,916)
Property | New Zealand Earthquake (2011) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (7,497)
Property | Tohoku Earthquake and Tsunami (2011) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (5,198)
Property | New Zealand Earthquake (2010) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 47,071
Property | Small catastrophe events and attritional loss movements |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (34,751) | (41,589) | 5,339
Property | Other small catastrophe events and attritional loss movements |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (34,751) | (41,589) | 5,339
Property | Operating Segments |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (233,373) | (157,049) | (2,973)
Casualty and Specialty |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (16,097) | (26,763) | (23,882)
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 | (19,078) | (29,280) | (52,796)
Casualty and Specialty | Actuarial assumption changes |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | 2,981 | 2,517 | 28,914
Casualty and Specialty | Operating Segments |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | $ (16,097) | $ (26,763) | $ (23,882)

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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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