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Income Taxes (Schedule Of Roll Forward Of Valuation Allowance For Deferred Income Tax Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Abstract]      
Valuation Allowance, Balance at beginning of period $ 67,662 $ 64,486 $ 15,628
Charged (Credited) to Costs and Expenses 3,166 3,176 48,858
Other Adjustments [1] (25,017)    
Valuation Allowance, Balance at end of period $ 45,811 $ 67,662 $ 64,486
[1] During the year ended December 31, 2017, the decrease in valuation allowance is due to the Tax Act.