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Income Taxes (Summary Of Provision For Income Taxes) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Tax Disclosure [Abstract]        
Tax (benefit) expense $ 199 $ 6,886 $ 733 $ 1,599
Pretax loss $ (22,618) $ (148,547) $ (77,692) $ (165,351)
Effective tax rates (0.90%) (4.60%) (0.90%) (1.00%)