Stock Based Compensation Changes and Status 2013 Restricted Stock Nonvested Shares (Details) (USD $)	12 Months Ended		3 Months Ended	12 Months Ended								3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012 Key Management Twenty Twelve Restricted Stock Plan	Dec. 31, 2013 Key Management Twenty Twelve Restricted Stock Plan	Dec. 31, 2012 Key Management Twenty Twelve Restricted Stock Plan	Dec. 31, 2013 Key Management Twenty Thirteen Restricted Stock Plan	Dec. 31, 2013 Market Based Restricted Stock Key Management Twenty Twelve Restricted Stock Plan	Dec. 31, 2013 Market Based Restricted Stock Key Management Twenty Thirteen Restricted Stock Plan	Dec. 31, 2013 Three Months Key Management Twenty Twelve Restricted Stock Plan	Dec. 31, 2012 Three Months Key Management Twenty Twelve Restricted Stock Plan	Dec. 31, 2013 Three Months Key Management Twenty Thirteen Restricted Stock Plan	Dec. 31, 2013 One Year from Balance Sheet Date Key Management Twenty Twelve Restricted Stock Plan	Dec. 31, 2013 One Year from Balance Sheet Date Key Management Twenty Twelve Restricted Stock Plan	Dec. 31, 2012 One Year from Balance Sheet Date Key Management Twenty Twelve Restricted Stock Plan	Dec. 31, 2013 One Year from Balance Sheet Date Key Management Twenty Thirteen Restricted Stock Plan	Dec. 31, 2013 More than One and within Two Years from Balance Sheet Date Key Management Twenty Twelve Restricted Stock Plan	Dec. 31, 2012 More than One and within Two Years from Balance Sheet Date Key Management Twenty Twelve Restricted Stock Plan	Dec. 31, 2013 More than One and within Two Years from Balance Sheet Date Key Management Twenty Thirteen Restricted Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage							25.00%	25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate										0.00%	0.07%			0.17%	0.17%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period									3 months		3 months	1 year	1 year		1 year	2 years		2 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate					4.19%	4.269%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 0	$ 0	$ 62.55	$ 62.55		$ 65.12
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate														31.17%	16.40%		29.65%	20.92%
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized				$ 1,203,000		$ 1,556,000
Employee Service Share Based Compensation Unrecognized Compensation Costs Nonvested Awards Weighted Average Period Of Recognition				1 year 4 months 2 days		1 year 5 months