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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
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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.

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- Definition Deferred Tax Assets, Valuation Allowance, Other Adjustments + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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