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Organization and Basis of Presentation (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011
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		$ 592,435,000
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount of Application Adjustment		28,331,000
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount after Application		620,766,000
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	261,282,000
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount of Application Adjustment	13,237,000
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount after Application	274,519,000
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	200,406,000	442,255,000
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount of Application Adjustment	(13,237,000)	(28,331,000)
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount after Application	187,169,000	413,924,000
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	67,518,000	148,551,000
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount of Application Adjustment	(4,293,000)	(7,491,000)
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount after Application	63,225,000	141,060,000
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	132,888,000	293,704,000
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount of Application Adjustment	(8,944,000)	(20,840,000)
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount after Application	123,944,000	272,864,000
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	1.80	3.99
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount of Application Adjustment	(0.12)	(0.28)
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount after Application	1.68	3.71
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	1.78	3.96
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount of Application Adjustment	(0.12)	(0.28)
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount after Application	1.66	3.68
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		33,008,000
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount of Application Adjustment		28,331,000
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount after Application		61,339,000
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		(34,698,000)
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount of Application Adjustment		(7,491,000)
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount after Application		$ (42,189,000)

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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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-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

-SubTopic 10

-Section 50

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