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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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