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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, 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

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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=6907707&loc=d3e32537-109319 + Details
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- References No definition available. + Details
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