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Income Taxes (Summary Of Provision For Income Taxes) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Tax Disclosure [Abstract]    
Tax (benefit) expense $ 361 $ (295)
Pretax loss $ (21,917) $ (34,105)
Effective tax rates (percentage) (1.60%) 0.90%