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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, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |
Annual direct premiums written | $ 2,737,472 | $ 2,655,720 | $ 2,579,683
Private Passenger Automobile [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Annual direct premiums written | 2,165,557 | 2,140,531 | 2,105,602
Homeowners [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Annual direct premiums written | 340,013 | 318,295 | 285,188
Commercial Automobile [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Annual direct premiums written | 104,689 | 74,655 | 75,642
Other Lines [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Annual direct premiums written | $ 127,213 | $ 122,239 | $ 113,251

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- Definition Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written. + 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 Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(1) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
Name: | us-gaap_DirectPremiumsWritten
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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