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Debt And Liquidity (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total debt $ 2,033,208 $ 2,156,634
Less: Short-term debt (15,492) (106,323)
Long-term debt 2,017,716 2,050,311
Senior Subordinated Notes [Member]    
Debt Instrument [Line Items]    
Total debt 2,032,463 2,155,883
Other Debt    
Debt Instrument [Line Items]    
Total debt $ 745 $ 751