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Stock-Based Compensation (Summary Of Restricted Stock Units) (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Shares [Roll Forward]      
Outstanding, beginning of period (in shares) 1,253,927    
Granted (in shares) 1,531,702 930,831  
Vested (in shares) (540,790)    
Forfeited (in shares) (12,971)    
Outstanding, end of period (in shares) 2,231,868   1,253,927
Weighted-average price [Roll forward]      
Outstanding, beginning of period (in dollars per share) $ 8.87    
Granted (in dollars per share) 6.87    
Vested (in dollars per share) 8.70    
Forfeited (in dollars per share) 9.10    
Outstanding, end of period (in dollars per share) $ 7.54   $ 8.87
Average remaining contractual term (years) [Abstract]      
Granted 2 years 8 months 12 days    
Outstanding 2 years 3 months 7 days   1 year 7 months 20 days