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Summary Of Significant Accounting Policies (Direct Premium Attributable By Segment) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Segment Reporting Information [Line Items] |  |  |
Premiums written, net | $ 2,579,683 | $ 2,558,825 | $ 2,593,568
Private Passenger Automobile [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums written, net | 2,105,602 | 2,115,763 | 2,158,038
Homeowners [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums written, net | 285,188 | 261,560 | 240,885
Commercial Automobile [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums written, net | 75,642 | 84,503 | 93,955
Other Lines [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Premiums written, net | $ 113,251 | $ 96,999 | $ 100,690

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- Definition Premiums written for all insurance and reinsurance contracts, after adding premiums assumed from other insurers and subtracting any amounts ceded to another insurer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 27 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration