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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Abstract]      
Valuation Allowance, Balance at beginning of period $ 64,486 $ 15,628 $ 16,651
Charged (Credited) to Costs and Expenses 3,176 48,858 161
Other Adjustments     (1,184)
Valuation Allowance, Balance at end of period $ 67,662 $ 64,486 $ 15,628