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Stock-based Compensation (Summary Of Status Of Company's Equity Compensations Plans) (Details) - Stock Options [Member] - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Shares [Roll Forward]      
Granted (in shares) 0 300,000  
Exercised (in shares) (28,500) 0  
Equity Compensations Plans [Member]      
Shares [Roll Forward]      
Outstanding, beginning of period (in shares) 2,021,625    
Exercised (in shares) (28,500)    
Expired (in shares) (1,000)    
Forfeited (in shares) (38,750)    
Outstanding, end of period (in shares) 1,953,375   2,021,625
Exercisable, end of period (in shares) 1,705,875    
Weighted average exercise price [Roll Forward]      
Outstanding, beginning of period (in dollars per share) $ 8.32    
Exercised (in dollars per share) 7.36    
Expired (in dollars per share) 25.43    
Forfeited (in dollars per share) 8.37    
Outstanding, end of period (in dollars per share) 8.31   $ 8.32
Exercisable, end of period (in dollars per share) $ 8.50    
Weighted-average remaining contractual term (years) [Abstract]      
Outstanding, end of period 4 years 6 months 4 days   5 years 2 months 27 days
Exercisable, end of period 3 years 11 months 5 days    
Aggregate intrinsic value [Abstract]      
Outstanding, beginning of period    
Granted    
Exercised    
Expired    
Forfeited    
Outstanding, end of period 941,090  
Exercisable, end of period $ 599,090