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Earnings Per Common Share and Share Awards Summary of Share-based Award Transactions (Details) shares in Thousands | 12 Months Ended
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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

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