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Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Abstract] |  |  |
Balance at January 1 | $ (18,251) | $ (8,296) | $ (1,845)
Increases related to prior year tax positions | (4,104) | (2,658) |
Decreases related to prior year tax positions | 4,045 |  | 1,475
Increases related to current year tax positions |  | (7,297) | (7,926)
Decreases related to current year tax positions |  |  |
Decreases in unrecognized liability due to settlements with foreign tax authorities |  |  |
Balance at December 31 | $ (18,310) | $ (18,251) | $ (8,296)

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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