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Reserve for Losses and Loss Expenses (Reserve Loss Development) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Favorable or adverse loss development | $ (38,746) | $ (43,589) | $ (29,428)
Favorable or adverse loss development [Member] |  |  |
Favorable or adverse loss development | (39,000) |  |
Favorable or adverse loss development [Member] | Remaining Lines Of Business [Member] |  |  |
Favorable or adverse loss development | (10,000) | (11,000) |
Favorable or adverse loss development [Member] | Workers Compensation [Member] |  |  |
Favorable or adverse loss development |  |  | (11,000)
Favorable or adverse loss development [Member] | Accident Years 2005 Through 2007 [Member] | Workers Compensation [Member] |  |  |
Favorable or adverse loss development |  |  | (36,000)
Favorable or adverse loss development [Member] | Accident Year 2008 [Member] |  |  |
Favorable or adverse loss development |  |  | 29,000
Favorable or adverse loss development [Member] | Accident Year 2008 [Member] | Workers Compensation [Member] |  |  |
Favorable or adverse loss development |  |  | 22,000
Favorable or adverse loss development [Member] | Accident Years 2007 and Prior [Member] |  |  |
Favorable or adverse loss development |  |  | (29,000)
Favorable or adverse loss development [Member] | Accident Years 2006 And Prior [Member] | General Liability [Member] |  |  |
Favorable or adverse loss development |  | (26,000) |
Favorable or adverse loss development [Member] | Accident Years 2004 Through 2009 [Member] | Commercial Automobile [Member] |  |  |
Favorable or adverse loss development |  | (28,000) |
Favorable or adverse loss development [Member] | Accident Years 2008 And 2009 [Member] |  |  |
Favorable or adverse loss development |  | 24,000 |
Favorable or adverse loss development [Member] | Accident Years 2008 And 2009 [Member] | Homeowners [Member] |  |  |
Favorable or adverse loss development |  | (6,000) |
Favorable or adverse loss development [Member] | Accident Years 2008 And 2009 [Member] | Workers Compensation [Member] |  |  |
Favorable or adverse loss development |  | 22,000 |
Favorable or adverse loss development [Member] | Accident Years 2004 Through 2007 [Member] |  |  |
Favorable or adverse loss development |  | (44,000) |
Favorable or adverse loss development [Member] | Accident Years 2004 Through 2007 [Member] | General Liability [Member] |  |  |
Favorable or adverse loss development |  |  | (8,000)
Favorable or adverse loss development [Member] | Accident Years 2006 2008 And 2009 [Member] |  |  |
Favorable or adverse loss development | (60,000) |  |
Favorable or adverse loss development [Member] | Accident Year 2010 [Member] |  |  |
Favorable or adverse loss development | 24,000 |  |
Favorable or adverse loss development [Member] | Accident Years 2007 Through 2009 [Member] | Commercial Automobile [Member] |  |  |
Favorable or adverse loss development | (13,000) |  |
Favorable or adverse loss development [Member] | Accident Years 2009 And Prior [Member] | General Liability [Member] |  |  |
Favorable or adverse loss development | (12,000) |  |
Favorable or adverse loss development [Member] | Accident Years 2008 Through 2010 [Member] | Business Owners Policies [Member] |  |  |
Favorable or adverse loss development | (11,000) |  |
Favorable or adverse loss development [Member] | Accident Year 2010 Partially Offset By Earlier Accident Years [Member] | Workers Compensation [Member] |  |  |
Favorable or adverse loss development | 7,000 |  |
Favorable or adverse loss development [Member] | Accident Year 2007 [Member] | Commercial Automobile [Member] |  |  |
Favorable or adverse loss development |  |  | $ (10,000)

X
- Definition Amount of provision in the period for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-5 -Paragraph 11 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
Name: | us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration