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Debt (Schedule Of Aggregate Annual Maturities Of Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt [Abstract]    
2019 $ 113,350  
2020  
2021  
2022 587,500  
2023  
Thereafter 400,000  
Total 1,100,850  
Less: Discount and deferred financing costs, net on senior notes (9,018)  
Total debt (Carrying amount) $ 1,091,832 $ 824,602