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Income Taxes (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
Income Tax Disclosure [Abstract] |  |  |  |
Income tax expense | $ 19,974 | $ 50,205 | $ 49,009 | $ 98,830
Effective tax rates (percent) | 33.60% | 38.10% | 30.30% | 37.50%
Income tax expense credit from favorable outcome of state tax audits |  |  | $ 6,449 |

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