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Stock-based Compensation (Summary Of Status Of Company's Equity Compensation Plans) (Details) - Stock Options [Member] - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Shares [Roll Forward]      
Granted (in shares) 0 0  
Exercised (in shares) (23,125) (28,500)  
Equity Compensations Plans [Member]      
Shares [Roll Forward]      
Outstanding, beginning of period (in shares) 1,452,625    
Exercised (in shares) (23,125)    
Outstanding, end of period (in shares) 1,429,500   1,452,625
Exercisable, end of period (in shares) 1,268,250    
Weighted average exercise price [Roll Forward]      
Outstanding, beginning of period (in dollars per share) $ 8.30    
Exercised (in dollars per share) 9.45    
Outstanding, end of period (in dollars per share) 8.28   $ 8.30
Exercisable, end of period (in dollars per share) $ 8.45    
Weighted-average remaining contractual term (years) [Abstract]      
Outstanding, end of period 3 years 10 months 24 days   4 years 7 months 21 days
Exercisable, end of period 3 years 5 months 5 days    
Aggregate intrinsic value [Abstract]      
Outstanding, beginning of period    
Granted    
Exercised    
Expired    
Forfeited    
Outstanding, end of period 2,054,930  
Exercisable, end of period $ 1,628,930