Quarterly report pursuant to Section 13 or 15(d)

Income Taxes Income Taxes (Details)

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Income Taxes Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Components of Income Tax Expense (Benefit) [Line Items]    
Income Tax Expense (Benefit) $ 4,964 $ (7,577)