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Share-Based Compensation - Information pertaining to options oustanding - (Details) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share Based Compensation      
Range of exercise prices, low end of range (in dollars per share) $ 69.48 $ 61.42 $ 61.42
Range of exercise prices, high end of range (in dollars per share) $ 91.35 $ 69.48 $ 66.32
Options Outstanding      
Number outstanding (in shares) 218,689    
Weighted Average Remaining Contractual Life 5 years 4 months 24 days    
Weighted Average Exercise Price (in dollars per share) $ 52.75    
Options Exercisable      
Number outstanding (in shares) 148,702    
Weighted Average Exercise Price (in dollars per share) $ 41.62    
Weighted Average Remaining Contractual Life 4 years 1 month 6 days    
Restricted Stock.      
Vesting schedule of shares      
2017 37,713    
2018 34,337    
2019 51,940    
2020 3,905    
2021 3,405    
Thereafter 11,392    
$26.01 - $ 30.00      
Share Based Compensation      
Range of exercise prices, low end of range (in dollars per share) $ 26.01    
Range of exercise prices, high end of range (in dollars per share) $ 30.00    
Options Outstanding      
Number outstanding (in shares) 15,796    
Weighted Average Remaining Contractual Life 1 year 4 months 24 days    
Weighted Average Exercise Price (in dollars per share) $ 27.60    
Options Exercisable      
Number outstanding (in shares) 15,795    
Weighted Average Exercise Price (in dollars per share) $ 27.60    
$30.01 - $35.00      
Share Based Compensation      
Range of exercise prices, low end of range (in dollars per share) 30.01    
Range of exercise prices, high end of range (in dollars per share) $ 35.00    
Options Outstanding      
Number outstanding (in shares) 58,790    
Weighted Average Remaining Contractual Life 3 years 2 months 12 days    
Weighted Average Exercise Price (in dollars per share) $ 31.82    
Options Exercisable      
Number outstanding (in shares) 58,787    
Weighted Average Exercise Price (in dollars per share) $ 31.82    
$35.01 - $40.00      
Share Based Compensation      
Range of exercise prices, low end of range (in dollars per share) 35.01    
Range of exercise prices, high end of range (in dollars per share) $ 40.00    
Options Outstanding      
Number outstanding (in shares) 11,353    
Weighted Average Remaining Contractual Life 2 years 1 month 6 days    
Weighted Average Exercise Price (in dollars per share) $ 35.20    
Options Exercisable      
Number outstanding (in shares) 11,351    
Weighted Average Exercise Price (in dollars per share) $ 35.20    
$40.01 - $45.00      
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) $ 45.00    
Options Outstanding      
Number outstanding (in shares) 24,507    
Weighted Average Remaining Contractual Life 4 years 10 months 24 days    
Weighted Average Exercise Price (in dollars per share) $ 41.42    
Options Exercisable      
Number outstanding (in shares) 24,507    
Weighted Average Exercise Price (in dollars per share) $ 41.42    
$45.01 - $69.48      
Share Based Compensation      
Range of exercise prices, low end of range (in dollars per share) 45.01    
Range of exercise prices, high end of range (in dollars per share) $ 91.35    
Options Outstanding      
Number outstanding (in shares) 108,243    
Weighted Average Remaining Contractual Life 7 years 8 months 12 days    
Weighted Average Exercise Price (in dollars per share) $ 72.19    
Options Exercisable      
Number outstanding (in shares) 38,262    
Weighted Average Exercise Price (in dollars per share) $ 64.50