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Basis of Presentation (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011 | Dec. 31, 2010
Summary of financial statement amounts previously reported |  |  |  |  |  |
Total shareholders' equity As previously reported. |  |  |  |  | $ 1,086,926 | $ 880,007
Effect of change in accounting principle, net of taxes: |  |  |  |  |  |
Retained earnings | 896,683 |  | 896,683 |  | 840,644 |
Total shareholders' equity | 1,232,418 | 1,024,258 | 1,232,418 | 1,024,258 | 1,055,353 |
Net income |  |  |  |  |  |
As previously reported |  | 23,128 |  | 37,252 |  |
Net income | 32,266 | 23,637 | 72,040 | 37,593 |  |
Costs Associated with Acquiring or Renewing Insurance Contracts [Member] |  |  |  |  |  |
Effect of change in accounting principle, net of taxes: |  |  |  |  |  |
Retained earnings |  |  |  |  | (34,425) | (34,447)
Accumulated other comprehensive income (loss), net of taxes (Net unrealized gains and losses on fixed maturities and equity securities) |  |  |  |  | 2,852 | 1,531
Total shareholders' equity |  |  |  |  | 1,055,353 | 847,091
Net income |  |  |  |  |  |
Effect of change in accounting principle, net of taxes |  | 509 |  | 341 |  |
Net income |  | $ 23,637 |  | $ 37,593 |  |

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