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Share-Based Compensation - Assumptions Used in Black Scholes Model (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013 Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate		1.25%
Expected price volatility		45.68%
Dividend yield		2.96%
Forfeiture rate	5.00%	4.73%
Weighted-average expected life, until exercise		7 years 2 months 38 days

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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