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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, 2019 | Mar. 31, 2018
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | $ (4,306) | $ (31,335)
Other |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | 19 | 18
Property |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | 1,877 | (27,562)
Property | Large catastrophe events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (12,292) | (31,367)
Property | 2017 Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (10,918) | (27,109)
Property | Other |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (1,374) | (4,258)
Property | Small catastrophe events and attritional loss movements |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | 14,169 | 3,805
Property | Other small catastrophe events and attritional loss movements |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | 14,169 | 3,805
Property | Other Large and Small Catastrophe Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years |  | (500)
Casualty and Specialty |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (6,202) | (3,791)
Casualty and Specialty | Actuarial methods |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | $ (6,202) | $ (3,791)

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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=99382578&loc=d3e14764-158437 + Details
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