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Earnings Per Common Share and Share Awards Summary of Information of Fixed Stock Options (Details) | 12 Months Ended
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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

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