Annual report pursuant to Section 13 and 15(d)

Income Taxes (Schedule Of Income Before Income Tax Expense (Benefit) And Equity In Earnings Of 50% Or Less Owned Companies) (Details)

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Income Taxes (Schedule Of Income Before Income Tax Expense (Benefit) And Equity In Earnings Of 50% Or Less Owned Companies) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Contingency [Line Items]      
Income Before Income Tax Expense (Benefit) and Equity in Earnings of 50% or Less Owned Companies $ 35,205 $ (92,236) $ (1,751)
United States [Member]      
Income Tax Contingency [Line Items]      
Income Before Income Tax Expense (Benefit) and Equity in Earnings of 50% or Less Owned Companies 28,546 (93,145) (1,785)
Foreign [Member]      
Income Tax Contingency [Line Items]      
Income Before Income Tax Expense (Benefit) and Equity in Earnings of 50% or Less Owned Companies 4,748 (1,105) (934)
Eliminations And Other [Member]      
Income Tax Contingency [Line Items]      
Income Before Income Tax Expense (Benefit) and Equity in Earnings of 50% or Less Owned Companies $ 1,911 $ 2,014 $ 968