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Stock-based Compensation (Summary Of Status Of Company’s Restricted Stock Units) (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Shares [Roll Forward]      
Outstanding, beginning of period (in shares) 1,264,454    
Granted (in shares) 507,792 955,024  
Vested (in shares) (571,548)    
Forfeited (in shares) (9,803)    
Outstanding, end of period (in shares) 1,190,895   1,264,454
Weighted-average grant date fair value [Roll Forward]      
Outstanding, beginning of period (in dollars per share) $ 5.49    
Granted (in dollars per share) 11.07    
Vested (in dollars per share) 5.43    
Forfeited (in dollars per share) 7.65    
Outstanding, end of period (in dollars per share) $ 7.88   $ 5.49
Average remaining contractual term (years) [Abstract]      
Outstanding 1 year 6 months 29 days   1 year 8 months 1 day