Earnings Per Common Share and Share Awards Summary Of Share-Based Award Transactions (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number Of Shares, Options exercised	(2,650)	(6,380)	(7,700)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price, Options exercised	$ 28.63	$ 25.17	$ 20.15
StockOptionsAndStockAppreciationRightsSARS
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number Of Shares, Outstanding Beginning Balance	98,150	101,600	110,800
Number Of Shares, Options/SARs cancelled/forfeited/expired	0	(70)	(4,500)
Number Of Shares, Outstanding Ending Balance	19,000	98,150	101,600	110,800
Number Of Shares, Exercisable as of December 31, 2013	18,250
Number Of Shares, Unvested as of December 31, 2013	750
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price, Outstanding Beginning Balance	$ 30.74	$ 29.81	$ 28.77
Weighted Average Exercise Price, Options/SARs cancelled/forfeited/expired	$ 0.00	$ 31.00	$ 28.61
Weighted Average Exercise Price, Outstanding Ending Balance	$ 45.74	$ 30.74	$ 29.81	$ 28.77
Weighted Average Exercise Price, Exercisable as of December 31, 2013	$ 44.67
Weighted Average Exercise Price, Unvested as of December 31, 2013	$ 71.59
Average Remaining Contractual Term, Outstanding Beginning Balance	3 years 5 months 5 days	3 years 2 months 1 day	3 years 10 months 28 days	4 years 6 months 4 days
Average Remaining Contractual Term, Outstanding Ending Balance	3 years 5 months 5 days	3 years 2 months 1 day	3 years 10 months 28 days	4 years 6 months 4 days
Average Remaining Contractual Term, Exercisable as of December 31, 2013	3 years 3 months 22 days
Average Remaining Contractual Term, Unvested as of December 31, 2013	6 years 4 months 17 days
Aggregate Intrinsic Value, Outstanding Beginning Balance	$ 2,871,710	$ 697,780	$ 353,955
Aggregate Intrinsic Value, Outstanding Ending Balance	669,610	2,871,710	697,780	353,955
Aggregate Intrinsic Value, Exercisable as of December 31, 2013	662,567
Aggregate Intrinsic Value, Unvested as of December 31, 2013	$ 7,043
SARs
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number Of Shares, SARs granted	3,000	3,000	3,000
Number Of Shares, Options exercised	(79,500)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price, SARs granted	$ 71.59	$ 50.50	$ 41.50
Weighted Average Exercise Price, Options exercised	$ 28.77