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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Income Tax Disclosure [Abstract]        
Income Tax Expense (Benefit) $ (23,260) $ 49,119 $ (57,162) $ 54,083