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Debt And Liquidity (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total debt $ 2,036,362 $ 2,156,634
Less: Short-term debt (70,861) (106,323)
Long-term debt 1,965,501 2,050,311
Senior Subordinated Notes    
Debt Instrument [Line Items]    
Total debt 2,035,624 2,155,883
Other Debt    
Debt Instrument [Line Items]    
Total debt $ 738 $ 751