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Stock-Based Compensation Plans - Outstanding and Exercisable Options (Details)
 12 Months Ended
Dec. 31, 2016
$ / 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
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price $ 52.61
Options Outstanding (in shares) | shares 180,680
Options Outstanding, Weighted Average Remaining Contractual Life (In Years) 1 year 3 months 18 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 52.61
Options Exercisable (in shares) | shares 180,680
Weighted Average Exercise Price of Options Exercisable (in dollars per share) $ 52.61
Exercise Price $38  
Stock Option Plans  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price $ 38.00
Options Outstanding (in shares) | shares 12,000
Options Outstanding, Weighted Average Remaining Contractual Life (In Years) 2 years 4 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 38.00
Options Exercisable (in shares) | shares 12,000
Weighted Average Exercise Price of Options Exercisable (in dollars per share) $ 38.00
Range of Exercise Price $42 - $45  
Stock Option Plans  
Range of exercise price, lower limit (in dollars per share) 42
Range of exercise price, upper limit (in dollars per share) 45
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price $ 43.68
Options Outstanding (in shares) | shares 45,225
Options Outstanding, Weighted Average Remaining Contractual Life (In Years) 1 year 4 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 43.68
Options Exercisable (in shares) | shares 45,225
Weighted Average Exercise Price of Options Exercisable (in dollars per share) $ 43.68
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
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price $ 55.73
Options Outstanding (in shares) | shares 99,455
Options Outstanding, Weighted Average Remaining Contractual Life (In Years) 1 year 1 month 6 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 55.73
Options Exercisable (in shares) | shares 99,455
Weighted Average Exercise Price of Options Exercisable (in dollars per share) $ 55.73
Range of Exercise Price $61 - $67  
Stock Option Plans  
Range of exercise price, lower limit (in dollars per share) 61
Range of exercise price, upper limit (in dollars per share) 67
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price $ 63.81
Options Outstanding (in shares) | shares 24,000
Options Outstanding, Weighted Average Remaining Contractual Life (In Years) 10 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 63.81
Options Exercisable (in shares) | shares 24,000
Weighted Average Exercise Price of Options Exercisable (in dollars per share) $ 63.81