Annual report pursuant to Section 13 and 15(d)

Income Taxes (Schedule Of Roll Forward Of Valuation Allowance For Deferred Income Tax Assets) (Details)

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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Abstract]      
Valuation Allowance, Balance at beginning of period $ 42,122 $ 45,811 $ 67,662
Charged (Credited) to Costs and Expenses (13,473) (3,486) 3,166
Other Adjustments [1] (17) (203) (25,017)
Valuation Allowance, Balance at end of period $ 28,632 $ 42,122 $ 45,811
[1] During the year ended December 31, 2017, the decrease in valuation allowance is due to the Tax Act.