Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014 State	Dec. 31, 2013	Dec. 31, 2012	Aug. 10, 2014	Feb. 13, 2014	Aug. 09, 2013	Feb. 13, 2015
Summary Of Significant Accounting Policies [Line Items]
Number of insurance companies	13
Number of States in which Entity Operates	13
Percentage of direct premiums written as private passenger automobile lines of insurance	77.00%
Percentage of private passenger automobile premiums written in California	83.00%	81.00%	78.00%
Percentage by which dividend income on non redeemable preferred stock, partnership, common stock is partially tax-sheltered	70.00%
Other liabilities	$ 207,028,000	$ 170,665,000
Marketable securities, fixed maturities	0
Marketable securities, equity securities	11,700,000
Insurance companies security deposits	18,000,000	17,000,000
Deferred policy acquisition cost amortization	526,208,000	505,517,000	477,788,000
Advertising expenses	23,000,000	20,000,000	19,000,000
Impairment charges	0	0	0
Goodwill impairment loss	0	0
Premiums written, net	2,840,000,000	2,730,000,000	2,650,000,000
Credit facility amount	150,000,000
FFL [Member]
Summary Of Significant Accounting Policies [Line Items]
Notional amount	114,000,000
AFL [Member]
Summary Of Significant Accounting Policies [Line Items]
Notional amount	144,000,000
Options Granted Prior To 2008 [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Option vesting term, years	4 years
Options Granted Prior To 2008 [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Option vesting term, years	5 years
Options Granted Subsequent To January 1, 2008 [Member]
Summary Of Significant Accounting Policies [Line Items]
Option vesting term, years	4 years
Building [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful life, in years	30 years
Building [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful life, in years	40 years
Furniture Equipment And Purchase Software [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful life, in years	3 years
Furniture Equipment And Purchase Software [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful life, in years	7 years
Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful life, in years	7 years
Swap [Member] | FFL [Member]
Summary Of Significant Accounting Policies [Line Items]
Term of swap agreement				3 years
Notional amount	114,000,000
Swap agreement collateral	30,000,000
Swap [Member] | AFL [Member]
Summary Of Significant Accounting Policies [Line Items]
Term of swap agreement		3 years
Notional amount	144,000,000
Swap agreement collateral	40,000,000
LIBOR [Member] | Swap [Member] | FFL [Member]
Summary Of Significant Accounting Policies [Line Items]
Basis spread on variable rate					1.40%
LIBOR [Member] | Swap [Member] | AFL [Member]
Summary Of Significant Accounting Policies [Line Items]
Basis spread on variable rate						1.20%
Secured Note No1 [Member]
Summary Of Significant Accounting Policies [Line Items]
Debt instrument, fair value	120,000,000
Secured Note No2 [Member]
Summary Of Significant Accounting Policies [Line Items]
Debt instrument, fair value	20,000,000
Call Option [Member]
Summary Of Significant Accounting Policies [Line Items]
Other liabilities	200,000	100,000
Unsecured Debt [Member]
Summary Of Significant Accounting Policies [Line Items]
Debt instrument, fair value	150,000,000	50,000,000
Revolving Credit Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Credit facility amount	$ 150,000,000
Scenario, Forecast [Member] | LIBOR [Member] | Swap [Member] | FFL [Member]
Summary Of Significant Accounting Policies [Line Items]
Basis spread on variable rate							1.35%