Share Based Compensation and Employee Benefit Plans (Details) (Stock Options [Member], USD $)	12 Months Ended
Dec. 31, 2010 Y	Dec. 31, 2009 Y
Stock Options [Member]
Weighted average fair value of options and valuation assumptions
Weighted average grant-date fair value	$ 9.27	$ 2.47
Assumptions:
Risk-free interest rate	3.14%	2.26%
Expected dividend yield	2.90%	8.00%
Expected volatility	52.16%	45.64%
Weighted average expected life of options	7.8	6.9

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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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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