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Stock Based Compensation, Stock Incentive Plan (Details) - Stock Incentive Plan [Member] - shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Stock Based Compensation [Abstract]    
Number of shares authorized (in shares) 350,000  
Stock Options [Member]    
Stock Based Compensation [Abstract]    
Award vesting period 3 years  
Stock options granted (in shares) 0 0
Stock options outstanding (in shares) 0 0
Stock Options [Member] | Minimum [Member]    
Stock Based Compensation [Abstract]    
Exercise price of options as percentage of market price 100.00%  
Stock Options [Member] | Maximum [Member]    
Stock Based Compensation [Abstract]    
Award term 10 years