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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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