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Organization and Basis of Presentation (Details) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011
Policy Acquisition Costs And Other Insurance Expenses [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount before Application	$ 149,228,000	$ 741,663,000
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount of Application Adjustment	15,144,000	43,475,000
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount after Application	164,372,000	785,138,000
Income Before Income Taxes [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount before Application	171,540,000	613,795,000
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount of Application Adjustment	(15,144,000)	(43,475,000)
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount after Application	156,396,000	570,320,000
Provision For Income Taxes [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount before Application	24,155,000	172,706,000
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount of Application Adjustment	(2,361,000)	(9,852,000)
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount after Application	21,794,000	162,854,000
Net Income [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount before Application	147,385,000	441,089,000
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount of Application Adjustment	(12,783,000)	(33,623,000)
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount after Application	134,602,000	407,466,000
Basic Earnings Per Share [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount before Application	2.00	5.99
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount of Application Adjustment	(0.18)	(0.46)
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount after Application	1.82	5.53
Diluted Earnings Per Share [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount before Application	1.98	5.94
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount of Application Adjustment	(0.17)	(0.45)
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount after Application	1.81	5.49
Change In Operating Assets And Liabilities Deferred Policy Acquisition Costs [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount before Application		(104,267,000)
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount of Application Adjustment		43,475,000
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount after Application		(60,792,000)
Change In Operating Assets And Liabilities Deferred Income Taxes [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount before Application		68,059,000
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount of Application Adjustment		(9,852,000)
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount after Application		$ 58,207,000

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 154

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-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.



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 154

-Paragraph 17

-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.



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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 154

-Paragraph 17

-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 250

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-URI http://asc.fasb.org/extlink&oid=6801783&loc=d3e22580-107794



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