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Summary of Significant Accounting Policies (Details 5) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fair value of options granted was estimated on the dates of grant using weighted-average assumptions
Number of options granted	296,188	313,000	361,456
Weighted average grant date fair value of options granted	$ 6.02	$ 6.20	$ 5.80
Weighted average assumptions:
Risk-free interest rate	1.00%	2.20%	2.70%
Expected dividend yield	2.20%	2.20%	2.20%
Expected life, in years	5 years 9 months 18 days	5 years 9 months 18 days	5 years 10 months 24 days
Expected volatility (based on historical volatility)	45.10%	45.00%	51.50%

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Gross number of share options (or share units) granted during the period.

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No definition available.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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