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Income Taxes (Details) (USD $) In Thousands | 6 Months Ended
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Jun. 30, 2011 | Jun. 30, 2010
Income Taxes (Textuals) |  |
Reduction of companys liabilities for uncertain tax positions due to settlements and closures of various tax years | $ 3,637 | $ 14,115
Reduction in income tax expense |  | $ 8,882

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