Earnings Per Common Share and Share Awards Summary of Information of Fixed Stock Options (Details)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number Outstanding | shares	0
$32.00 - $32.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
SARs exercise price, lower limit	$ 32.00
SARs exercise price, upper limit	$ 32.00
Share-based Compensation, Shares Authorized under Stock Appreciation Rights Plans, Exercise Price Range, Number of Outstanding Shares | shares	2,000
SARs Outstanding - Weighted Average Remaining Contractual Life	4 months 20 days
SARs - Weighted Average Exercise Price	$ 32.00
SARs Exercisable - Number Exercisable | shares	2,000
SARs Exercisable - Weighted Average Exercise Price	$ 32.00
$33.31 - $33.31
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
SARs exercise price, lower limit	33.31
SARs exercise price, upper limit	$ 33.31
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	$ 33.31
SARs Exercisable - Number Exercisable | shares	2,500
SARs Exercisable - Weighted Average Exercise Price	$ 33.31
$36.80 - $73.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
SARs exercise price, lower limit	36.80
SARs exercise price, upper limit	$ 73.00
Share-based Compensation, Shares Authorized under Stock Appreciation Rights Plans, Exercise Price Range, Number of Outstanding Shares | shares	17,500
SARs Outstanding - Weighted Average Remaining Contractual Life	4 years 8 months 12 days
SARs - Weighted Average Exercise Price	$ 63.30
SARs Exercisable - Number Exercisable | shares	16,375
SARs Exercisable - Weighted Average Exercise Price	$ 62.63
$32.00 - $73.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
SARs exercise price, lower limit	32.00
SARs exercise price, upper limit	$ 73.00
Share-based Compensation, Shares Authorized under Stock Appreciation Rights Plans, Exercise Price Range, Number of Outstanding Shares | shares	22,000
SARs Outstanding - Weighted Average Remaining Contractual Life	3 years 11 months 4 days
SARs - Weighted Average Exercise Price	$ 57.05
SARs Exercisable - Number Exercisable | shares	20,875
SARs Exercisable - Weighted Average Exercise Price	$ 56.18