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Stock-Based Compensation Plans - Outstanding and Exercisable Options (Details)
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Stock Option Plans  
Range of exercise price, lower limit (in dollars per share) $ 38
Range of exercise price, upper limit (in dollars per share) $ 67
Options Outstanding and Exercisable (in shares) | shares 75,275
Options Outstanding and Exercisable, Weighted Average Remaining Contractual Life (In Years) 10 months 24 days
Options Outstanding and Exercisable, Weighted Average Exercise Price (in dollars per share) $ 52.30
Exercise Price $38  
Stock Option Plans  
Weighted Average Exercise Price of Options Exercisable (in dollars per share) $ 38
Options Outstanding and Exercisable (in shares) | shares 12,000
Options Outstanding and Exercisable, Weighted Average Remaining Contractual Life (In Years) 1 year 4 months 24 days
Options Outstanding and Exercisable, Weighted Average Exercise Price (in dollars per share) $ 38.00
Range of Exercise Price $44 - $45  
Stock Option Plans  
Range of exercise price, lower limit (in dollars per share) 44
Range of exercise price, upper limit (in dollars per share) $ 45
Options Outstanding and Exercisable (in shares) | shares 16,000
Options Outstanding and Exercisable, Weighted Average Remaining Contractual Life (In Years) 2 years 4 months 24 days
Options Outstanding and Exercisable, Weighted Average Exercise Price (in dollars per share) $ 44.99
Range of Exercise Price $55 - $56  
Stock Option Plans  
Range of exercise price, lower limit (in dollars per share) 55
Range of exercise price, upper limit (in dollars per share) $ 56
Options Outstanding and Exercisable (in shares) | shares 35,275
Options Outstanding and Exercisable, Weighted Average Remaining Contractual Life (In Years) 1 month 6 days
Options Outstanding and Exercisable, Weighted Average Exercise Price (in dollars per share) $ 55.73
Range of Exercise Price $66 - $67  
Stock Option Plans  
Range of exercise price, lower limit (in dollars per share) 66
Range of exercise price, upper limit (in dollars per share) $ 67
Options Outstanding and Exercisable (in shares) | shares 12,000
Options Outstanding and Exercisable, Weighted Average Remaining Contractual Life (In Years) 4 months 24 days
Options Outstanding and Exercisable, Weighted Average Exercise Price (in dollars per share) $ 66.28