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Income Taxes (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 Taxes (Textual) [Abstract]        
Income tax benefit (expense) $ (2,074) $ 13,495 $ (4,978) $ 14,722
Effective income tax rate 61.30% 57.70% 51.50% 33.70%
U.S federal Statutory rate     35.00%