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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of Insurance Companies | 13 |  |
Percentage of direct premiums written as private passenger automobile lines of insurance | 81.00% | 81.00% | 81.00%
Percentage of private passenger automobile premiums written in California | 77.00% | 77.00% | 79.00%
Percentage by which dividend income on non-redeemable preferred stock, partnership, common stock is partially tax-sheltered | 70.00% |  |
Other liabilities | $ 149,007,000 | $ 167,093,000 |
Marketable securities fixed maturities | 47,500,000 |  |
Marketable securities equity maturities | 10,000,000 |  |
Financial instrument, fair value | 140,000,000 | 267,210,000 |
Insurance Companies security deposits | 18,000,000 | 14,000,000 |
Senior notes retired | 125,000,000 | 0 | 0
Advertising expenses | 21,000,000 | 30,000,000 | 27,000,000
Impairment charges | 0 | 0 | 0
Goodwill impairment loss | 0 |  |
Premiums written, net | 2,579,683,000 | 2,558,825,000 | 2,593,568,000
Broker direct premium percentage | 0.02 | 0.02 | 0.02
Compensation cost recognized if performance goals not achieved | 0 |  |
Parent Company [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other liabilities | 272,000 | 739,000 |
Buildings [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful life, minimum in year | 30 |  |
Useful life, maximum in year | 40 |  |
Furniture, Equipment, And Purchase Software [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful life, minimum in year | 3 |  |
Useful life, maximum in year | 7 |  |
Software [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life, in years | 5 |  |
Restricted Stock [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Compensation cost recognized if performance goals not achieved | 460,000 | 161,000 |
Options Granted Subsequent To January 1, 2008 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Option vesting term, years | four |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Targeted number of common share expected to vest | 80,000 |  |
Performance period of restricted stock and restricted stock units, vesting years | 3 |  |
Restricted Stock And Restricted Stock Units [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of shares granted | 80,000 | 55,000 |
Maximum [Member] | Options Granted Prior To 2008 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Option vesting term, maximum years | five |  |
Maximum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Targeted number of common share expected to vest | 120,000 |  |
Number of shares granted | 120,000 |  |
Minimum [Member] | Options Granted Prior To 2008 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Option vesting term, minimum years | four |  |
Secured Note No. 1 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Financial instrument, fair value | 120,000,000 |  |
Secured Note No. 2 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Financial instrument, fair value | 20,000,000 |  |
Senior Notes [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Financial instrument, fair value | 125,000,000 |  |
Senior notes retired | 125,000,000 |  |
Unsecured senior notes interest rate | 7.25% |  |
Notes maturity date | Aug. 15, 2011 |  |
Maturity date of senior notes | August 15, 2011 |  |
Call Option [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other liabilities | $ 700,000 | $ 2,800,000 |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -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 FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration