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, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Income before income tax expense (benefit) and equity in earnings of 50% or less owned companies	$ 91,689	$ 35,205	$ (92,236)
Reportable Geographical Components | United States
Income Tax Contingency [Line Items]
Income before income tax expense (benefit) and equity in earnings of 50% or less owned companies	33,563	28,546	(93,145)
Reportable Geographical Components | Foreign
Income Tax Contingency [Line Items]
Income before income tax expense (benefit) and equity in earnings of 50% or less owned companies	56,558	4,748	(1,105)
Eliminations
Income Tax Contingency [Line Items]
Income before income tax expense (benefit) and equity in earnings of 50% or less owned companies	$ 1,568	$ 1,911	$ 2,014