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Share-Based Compensation Arrangements (Details) (Stock Appreciation Rights (SARs) [Member])	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Fair value of stock appreciation rights
Dividend yield	0.00%	0.00%
Volatility	63.02%	66.50%
Maximum [Member]
Fair value of stock appreciation rights
Risk Free Interest Rate	0.84%	0.63%
Expected life (years)	3 years 6 months	4 years 6 months
Minimum [Member]
Fair value of stock appreciation rights
Risk Free Interest Rate	0.28%	0.38%
Expected life (years)	1 year 8 months 12 days	2 years 8 months 12 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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