Annual report pursuant to Section 13 and 15(d)

Stock Compensation (Schedule of Changes in Number of Outstanding Stock Options Under Director Plan, Stock Plan and 2011 Incentive Plan) (Details)

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Stock Compensation (Schedule of Changes in Number of Outstanding Stock Options Under Director Plan, Stock Plan and 2011 Incentive Plan) (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock Compensation [Abstract]      
Options, Outstanding - December 31, 1,172,659 922,930  
Options, Awarded 278,665 288,186  
Options, Exercised 0 0  
Options, Forfeited (70,832) (38,457)  
Options, Outstanding - December 31, 1,380,492 1,172,659 922,930
Options, Exercisable at December 31, 2018 920,556    
Options, Expected to vest December 31, 2018 1,380,492    
Weighted average exercise price per share, Outstanding - December 31, $ 8.63 $ 10.10  
Weighted average exercise price per share, Awarded 3.43 4.35  
Weighted average exercise price per share, Forfeited 8.56 11.61  
Weighted average exercise price per share, Outstanding - December 31, 7.56 $ 8.63 $ 10.10
Weighted average exercise price per share, Exercisable at December 31, 2018 9.14    
Weighted average exercise price per share, Expected to vest December 31, 2018 $ 7.56    
Options, Outstanding - Weighted average remaining contractual term (in years) 4 years 2 months 5 days 4 years 6 months 18 days 4 years 10 months 24 days
Options, Exercisable - Weighted average remaining contractual term (in years) 3 years 5 months 5 days    
Options, Expected to vest - Weighted average remaining contractual term (in years) 4 years 2 months 5 days