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Share-Based Compensation - Information pertaining to options outstanding (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share Based Compensation      
Range of exercise prices, low end of range (in dollars per share) $ 61.42 $ 87.30 $ 87.30
Range of exercise prices, high end of range (in dollars per share) $ 91.35 $ 91.35 $ 91.35
Options Outstanding      
Number outstanding (in shares) 256,425    
Weighted Average Remaining Contractual Life 4 years 6 months    
Weighted Average Exercise Price (in dollars per share) $ 59.01    
Options Exercisable      
Number outstanding (in shares) 256,425    
Weighted Average Exercise Price (in dollars per share) $ 59.01    
Weighted Average Remaining Contractual Life 4 years 6 months    
Restricted Stock      
Vesting schedule of shares      
2021 7,935    
2022 751    
2023 751    
2024 1,567    
Total 11,004 69,450  
19.16 To 40.00      
Share Based Compensation      
Range of exercise prices, low end of range (in dollars per share) $ 19.16    
Range of exercise prices, high end of range (in dollars per share) $ 40.00    
Options Outstanding      
Number outstanding (in shares) 45,002    
Weighted Average Remaining Contractual Life 3 years 1 month 6 days    
Weighted Average Exercise Price (in dollars per share) $ 31.11    
Options Exercisable      
Number outstanding (in shares) 45,002    
Weighted Average Exercise Price (in dollars per share) $ 31.11    
Weighted Average Remaining Contractual Life 3 years 1 month 6 days    
40.01 To 55.00      
Share Based Compensation      
Range of exercise prices, low end of range (in dollars per share) $ 40.01    
Range of exercise prices, high end of range (in dollars per share) $ 55.00    
Options Outstanding      
Number outstanding (in shares) 74,579    
Weighted Average Remaining Contractual Life 7 years 8 months 12 days    
Weighted Average Exercise Price (in dollars per share) $ 44.46    
Options Exercisable      
Number outstanding (in shares) 74,579    
Weighted Average Exercise Price (in dollars per share) $ 44.46    
Weighted Average Remaining Contractual Life 7 years 8 months 12 days    
55.01 To 70.00      
Share Based Compensation      
Range of exercise prices, low end of range (in dollars per share) $ 55.01    
Range of exercise prices, high end of range (in dollars per share) $ 70.00    
Options Outstanding      
Number outstanding (in shares) 74,609    
Weighted Average Remaining Contractual Life 4 years 1 month 6 days    
Weighted Average Exercise Price (in dollars per share) $ 63.61    
Options Exercisable      
Number outstanding (in shares) 74,609    
Weighted Average Exercise Price (in dollars per share) $ 63.61    
Weighted Average Remaining Contractual Life 4 years 1 month 6 days    
70.01 To 85.00      
Share Based Compensation      
Range of exercise prices, low end of range (in dollars per share) $ 70.01    
Range of exercise prices, high end of range (in dollars per share) 85.00    
85.01 To 91.35      
Share Based Compensation      
Range of exercise prices, low end of range (in dollars per share) 85.01    
Range of exercise prices, high end of range (in dollars per share) $ 91.35    
Options Outstanding      
Number outstanding (in shares) 62,235    
Weighted Average Remaining Contractual Life 6 years 7 months 6 days    
Weighted Average Exercise Price (in dollars per share) $ 91.12    
Options Exercisable      
Number outstanding (in shares) 62,235    
Weighted Average Exercise Price (in dollars per share) $ 91.12    
Weighted Average Remaining Contractual Life 6 years 7 months 6 days