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Income Taxes (Schedule Of Federal Statutory Income Tax Rate To Income Before Income Tax) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Abstract] |  |  |
Tax at statutory rate | $ 23,866 | $ 31,514 | $ 34,520
State taxes, net of federal tax effect | 1,102 | 1,295 | 1,615
Effect of foreign operations and tax incentives | (15,496) | (21,820) | (24,330)
Change in valuation allowance | (1,152) | (19,640) | (118)
Chinese retroactive tax incentive | 0 | 0 | (1,227)
Losses in foreign jurisdictions for which no benefit has been provided | 2,106 | 3,711 | 5,812
Change in uncertain tax benefits reserve | (8,270) | (1,653) | 0
Other | 1,985 | 1,231 | 1,116
Total income tax expense (benefit) | $ 4,141 | $ (5,362) | $ 17,388

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