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Earnings Per Common Share and Share Awards Summary of Share-based Award Transactions (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding - Number Outstanding | shares 0
$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
SARs Outstanding - As of December 31, 2018 | shares 3
SARs Outstanding - Weighted Average Remaining Contractual Life 4 months 13 days
SARs Outstanding - Weighted Average Exercise Price $ 50.50
SARs Exercisable - Number Exercisable | shares 3
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
SARs Outstanding - As of December 31, 2018 | shares 4
SARs Outstanding - Weighted Average Remaining Contractual Life 2 years 4 months 20 days
SARs Outstanding - Weighted Average Exercise Price $ 68.70
SARs Exercisable - Number Exercisable | shares 4
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
SARs Outstanding - As of December 31, 2018 | shares 8
SARs Outstanding - Weighted Average Remaining Contractual Life 2 years 6 months 29 days
SARs Outstanding - Weighted Average Exercise Price $ 72.44
SARs Exercisable - Number Exercisable | shares 8
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
SARs Outstanding - As of December 31, 2018 | shares 4
SARs Outstanding - Weighted Average Remaining Contractual Life 4 years 4 months 17 days
SARs Outstanding - Weighted Average Exercise Price $ 93.87
SARs Exercisable - Number Exercisable | shares 4
SARs Exercisable - Weighted Average Exercise Price $ 93.87
$150.00 - $199.99  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
SARs exercise price, lower limit 150.00
SARs exercise price, upper limit $ 199.99
SARs Outstanding - As of December 31, 2018 | shares 9
SARs Outstanding - Weighted Average Remaining Contractual Life 5 years 10 months 17 days
SARs Outstanding - Weighted Average Exercise Price $ 190.71
SARs Exercisable - Number Exercisable | shares 8
SARs Exercisable - Weighted Average Exercise Price $ 191.00
$50.00 - $199.99  
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 $ 199.99
SARs Outstanding - As of December 31, 2018 | shares 28
SARs Outstanding - Weighted Average Remaining Contractual Life 3 years 7 months 20 days
SARs Outstanding - Weighted Average Exercise Price $ 110.27
SARs Exercisable - Number Exercisable | shares 27
SARs Exercisable - Weighted Average Exercise Price $ 107.05