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Debt (Schedule Of Maturities Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt [Abstract]    
2020  
2021 800,000  
2022  
2023  
2024 500,000  
Thereafter  
Total $ 1,300,000 $ 1,300,000