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Stock-Based Compensation (Details) - Stock Options [Member] - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Summary of options outstanding by exercise price range    
Options Outstanding, Number Outstanding at 12/31/17 99,800  
Options Outstanding, Weighted Average Remaining Contractual Life (years) 1 year 6 months 25 days 1 year 6 months 25 days
Options Outstanding, Weighted Average Exercise Price $ 34.55  
Range One [Member]    
Summary of options outstanding by exercise price range    
Range of Exercise Price, Lower Range Limit 0  
Range of Exercise Price, Upper Range Limit $ 15.00  
Options Outstanding, Number Outstanding at 12/31/17 32,500  
Options Outstanding, Weighted Average Remaining Contractual Life (years) 2 years 5 months 16 days  
Options Outstanding, Weighted Average Exercise Price $ 14.95  
Range Two [Member]    
Summary of options outstanding by exercise price range    
Range of Exercise Price, Lower Range Limit 15.01  
Range of Exercise Price, Upper Range Limit $ 42.50  
Options Outstanding, Number Outstanding at 12/31/17 55,300  
Options Outstanding, Weighted Average Remaining Contractual Life (years) 1 year 4 months 28 days  
Options Outstanding, Weighted Average Exercise Price $ 40.62  
Range Three [Member]    
Summary of options outstanding by exercise price range    
Range of Exercise Price, Lower Range Limit 42.51  
Range of Exercise Price, Upper Range Limit $ 62.10  
Options Outstanding, Number Outstanding at 12/31/17 12,000  
Options Outstanding, Weighted Average Remaining Contractual Life (years) 1 year 7 months 6 days  
Options Outstanding, Weighted Average Exercise Price $ 59.60