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Earnings Per Common Share and Share Awards Summary of Information of Fixed Stock Options (Details)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding - Number Outstanding | shares 0
$30.00 - $39.99  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
SARs exercise price, lower limit $ 30.00
SARs exercise price, upper limit $ 39.99
Share-based Compensation, Shares Authorized under Stock Appreciation Rights Plans, Exercise Price Range, Number of Outstanding Shares | shares 2,500
SARs Outstanding - Weighted Average Remaining Contractual Life 4 months 17 days
SARs - Weighted Average Exercise Price $ 33.31
SARs Exercisable - Number Exercisable | shares 2,500
SARs Exercisable - Weighted Average Exercise Price $ 33.31
$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 2,500
SARs Outstanding - Weighted Average Remaining Contractual Life 1 year 4 months 17 days
SARs - Weighted Average Exercise Price $ 41.50
SARs Exercisable - Number Exercisable | shares 2,500
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 2 years 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 4 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 4 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
$80.00 - $89.99  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
SARs exercise price, lower limit 80.00
SARs exercise price, upper limit $ 89.99
Share-based Compensation, Shares Authorized under Stock Appreciation Rights Plans, Exercise Price Range, Number of Outstanding Shares | shares 0
SARs Outstanding - Weighted Average Remaining Contractual Life 0 days
SARs - Weighted Average Exercise Price $ 0.00
SARs Exercisable - Number Exercisable | shares 0
SARs Exercisable - Weighted Average Exercise Price $ 0.00
$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 6 years 4 months 17 days
SARs - Weighted Average Exercise Price $ 93.87
SARs Exercisable - Number Exercisable | shares 3,375
SARs Exercisable - Weighted Average Exercise Price $ 93.87
$30.00 - $99.99  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
SARs exercise price, lower limit 30.00
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 24,500
SARs Outstanding - Weighted Average Remaining Contractual Life 3 years 10 months 6 days
SARs - Weighted Average Exercise Price $ 65.85
SARs Exercisable - Number Exercisable | shares 23,375
SARs Exercisable - Weighted Average Exercise Price $ 64.50