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Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Abstract] |  |  |
Balance at January 1 | $ (8,296) | $ (1,845) | $ (16)
Increases related to prior year tax positions | (2,658) |  |
Decreases related to prior year tax positions |  | 1,475 |
Increases related to current year tax positions | (7,297) | (7,926) | (1,829)
Decreases related to current year tax positions |  |  |
Decreases in unrecognized liability due to settlements with foreign tax authorities |  |  |
Balance at December 31 | $ (18,251) | $ (8,296) | $ (1,845)

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