Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Income Taxes (Textuals) [Abstract]        
Effective income tax rate 41.00% 33.60% 51.90% 32.40%
Income tax (benefit) expense $ (20,846) $ 20,396 $ (19,313) $ 46,202