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Income Taxes (Narratives) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Income Tax Disclosure [Abstract] |  |  |  |
Income tax expense | $ 10,681 | $ 11,265 | $ 29,035 | $ 48,625
Effective tax rates (percent) | 22.10% | 34.60% | 28.40% | 36.90%
Income tax expense credit from favorable outcome of state tax audits |  |  | $ 6,449 |

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