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Senior Notes (Schedule Of Interest Expense Incurred In Connection With Senior Notes) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Senior Notes [Abstract]        
Interest expense incurred $ (4,868) $ 4,868 $ 9,736 $ 9,736