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Stock Compensation Plans - Summary of Fair Value of Awards Granted (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of fair value of awards granted [Abstract]
Risk-free interest rate (in hundredths)	1.00%	1.00%	2.20%
Expected life of option in years	5 years 4 months 13 days	5 years 4 months 20 days	5 years 6 months 4 days
Expected dividend yield of stock (in hundredths)	2.60%	2.30%	2.50%
Expected volatility of stock price (in hundredths)	56.00%	56.40%	49.00%
Weighted-average per share fair value of options granted (in dollars per share)	$ 12.25	$ 12.36	$ 11.42

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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