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Earnings Per Common Share and Share Awards Summary of Information of Fixed Stock Options (Details)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding - Number Outstanding | shares 0
$40.00 - $49.99  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
SARs exercise price, lower limit $ 40.00
SARs exercise price, upper limit $ 49.99
Share-based Compensation, Shares Authorized under Stock Appreciation Rights Plans, Exercise Price Range, Number of Outstanding Shares | shares 1,000
SARs Outstanding - Weighted Average Remaining Contractual Life 4 months 17 days
SARs - Weighted Average Exercise Price $ 41.50
SARs Exercisable - Number Exercisable | shares 1,000
SARs Exercisable - Weighted Average Exercise Price $ 41.50
$50.00 - $59.99  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
SARs exercise price, lower limit 50.00
SARs exercise price, upper limit $ 59.99
Share-based Compensation, Shares Authorized under Stock Appreciation Rights Plans, Exercise Price Range, Number of Outstanding Shares | shares 3,000
SARs Outstanding - Weighted Average Remaining Contractual Life 1 year 4 months 13 days
SARs - Weighted Average Exercise Price $ 50.50
SARs Exercisable - Number Exercisable | shares 3,000
SARs Exercisable - Weighted Average Exercise Price $ 50.50
$60.00 - $69.99  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
SARs exercise price, lower limit 60.00
SARs exercise price, upper limit $ 69.99
Share-based Compensation, Shares Authorized under Stock Appreciation Rights Plans, Exercise Price Range, Number of Outstanding Shares | shares 4,500
SARs Outstanding - Weighted Average Remaining Contractual Life 3 years 4 months 20 days
SARs - Weighted Average Exercise Price $ 68.70
SARs Exercisable - Number Exercisable | shares 4,500
SARs Exercisable - Weighted Average Exercise Price $ 68.70
$70.00 - $79.99  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
SARs exercise price, lower limit 70.00
SARs exercise price, upper limit $ 79.99
Share-based Compensation, Shares Authorized under Stock Appreciation Rights Plans, Exercise Price Range, Number of Outstanding Shares | shares 7,500
SARs Outstanding - Weighted Average Remaining Contractual Life 3 years 6 months 29 days
SARs - Weighted Average Exercise Price $ 72.44
SARs Exercisable - Number Exercisable | shares 7,500
SARs Exercisable - Weighted Average Exercise Price $ 72.44
$90.00 - $99.99  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
SARs exercise price, lower limit 90.00
SARs exercise price, upper limit $ 99.99
Share-based Compensation, Shares Authorized under Stock Appreciation Rights Plans, Exercise Price Range, Number of Outstanding Shares | shares 4,500
SARs Outstanding - Weighted Average Remaining Contractual Life 5 years 4 months 17 days
SARs - Weighted Average Exercise Price $ 93.87
SARs Exercisable - Number Exercisable | shares 4,500
SARs Exercisable - Weighted Average Exercise Price $ 93.87
$190.00 - $199.99  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
SARs exercise price, lower limit 190.00
SARs exercise price, upper limit $ 199.99
Share-based Compensation, Shares Authorized under Stock Appreciation Rights Plans, Exercise Price Range, Number of Outstanding Shares | shares 4,500
SARs Outstanding - Weighted Average Remaining Contractual Life 6 years 4 months 17 days
SARs - Weighted Average Exercise Price $ 192.71
SARs Exercisable - Number Exercisable | shares 3,375
SARs Exercisable - Weighted Average Exercise Price $ 192.71
$40.00 - $199.99  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
SARs exercise price, lower limit 40.00
SARs exercise price, upper limit $ 199.99
Share-based Compensation, Shares Authorized under Stock Appreciation Rights Plans, Exercise Price Range, Number of Outstanding Shares | shares 25,000
SARs Outstanding - Weighted Average Remaining Contractual Life 3 years 11 months 23 days
SARs - Weighted Average Exercise Price $ 93.40
SARs Exercisable - Number Exercisable | shares 23,875
SARs Exercisable - Weighted Average Exercise Price $ 88.72