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Income Taxes (Schedule Of Income From Continuing Operations Before Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income (loss) before income taxes:      
Domestic $ 67,549 $ 26,284 $ (9,116)
Foreign (82,461) 1,399 (14,091)
Income (loss) before income taxes (14,912) 27,683 (23,207)
Current income tax expense (benefit):      
Federal (20,560) 4,302 12,693
State 800 (709) 973
Foreign 3,247 3,255 6,064
Current income taxes, Total (16,513) 6,848 19,730
Deferred income tax expense (benefit):      
Federal (23,302) (2,505) (9,419)
State (949) 1,396 (1,035)
Foreign (12,399) (2,522) (348)
Deferred income taxes, Total (36,650) (3,631) (10,802)
Total income tax expense (benefit) [1] $ (53,163) $ 3,217 $ 8,928
[1] See Notes 1, 3, 4 and 17 for more information on losses associated with plant shutdowns, asset impairments and restructurings, unusual items, gains or losses from sale of assets, gains or losses on an investment accounted for under the fair value method and other items.