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Income Taxes (Details) (USD $) In Thousands | 9 Months Ended
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Sep. 30, 2011 | Sep. 30, 2010
Income Taxes (Textual) |  |
Reduction of company's liabilities for uncertain tax positions due to settlements and closures of various tax years | $ 3,637 | $ 14,230
Reclassified deferred tax liability to liability for uncertain tax position | 4,000 |
Reduction in income tax expense | $ 8,665 |

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