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Debt And Liquidity (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total debt $ 1,712,662 $ 1,812,823
Less: Short-term debt (8,141) (141)
Long-term debt 1,704,521 1,812,682
Senior Subordinated Notes    
Debt Instrument [Line Items]    
Total debt 1,712,022 1,812,204
Other debt    
Debt Instrument [Line Items]    
Total debt $ 640 $ 619