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Reserve for Claims and Claim Expenses (Cumulative Number of Claims Reported) (Details) - Excess of Loss Reinsurance Contracts | Dec. 31, 2016 claim
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2007 | Property |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 908
2007 | Casualty and Specialty |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 1,388
2008 | Property |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 1,350
2008 | Casualty and Specialty |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 1,368
2009 | Property |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 742
2009 | Casualty and Specialty |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 1,082
2010 | Property |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 781
2010 | Casualty and Specialty |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 1,030
2011 | Property |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 1,178
2011 | Casualty and Specialty |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 1,356
2012 | Property |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 667
2012 | Casualty and Specialty |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 1,253
2013 | Property |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 622
2013 | Casualty and Specialty |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 1,187
2014 | Property |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 523
2014 | Casualty and Specialty |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 1,353
2015 | Property |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 555
2015 | Casualty and Specialty |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 988
2016 | Property |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 548
2016 | Casualty and Specialty |
Claims Development [Line Items] |
Cumulative number of reported claims (in claims) | 365

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- Definition Number of reported claims for short-duration insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671317-158438 + Details
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