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Stock Compensation Plans (Details 4) (Employee Stock)	12 Months Ended
Stock Compensation Plans (Details 4) (Employee Stock)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Stock
Fair value of the option component of the ESP Plan
Risk free interest rate	0.16%	0.11%	0.27%
Dividend yield	1.49%	1.37%	1.21%
Volatility factor of the expected market price of the Company's common shares	27.00%	41.00%	34.00%
Expected life for the options (in years)	1 year	1 year	1 year

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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