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Share Based Compensation (Details 1) (USD $)	12 Months Ended
Share Based Compensation (Details 1) (USD $)	Dec. 31, 2011 Y	Dec. 31, 2010 Y	Dec. 31, 2009 Y
Fair value of stock options
Weighted-average fair value of options granted:	$ 6.24	$ 6.62	$ 0.0285
Weighted-average risk free interest rate:	0.65%	1.49%	1.75%
Dividend yield:	0.00%	0.00%	0.00%
Volatility:(1)	51.09%	41.44%	34.78%
Expected life:	4.0	4.0	4.0

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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