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Income Taxes (Components Of Income Before Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Abstract]      
Income before income taxes: Domestic $ (53,868) $ (580,720) $ 5,751
Income before income taxes: Foreign 14,056 (74,233) 11,636
Income (loss) before income taxes $ (39,812) $ (654,953) $ 17,387