Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Publisher SEC

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Percentage of vesting of share-based compensation awards.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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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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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Stock Compensation Plans (Details 3) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended															1 Months Ended	12 Months Ended
	Dec. 31, 2013 Restricted Stock Awards	Dec. 31, 2013 Restricted Stock Awards Time-vested	Dec. 31, 2013 Performance Stock Awards TSR Performance Stock Award	Dec. 31, 2012 Performance Stock Awards TSR Performance Stock Award	Dec. 31, 2011 Performance Stock Awards TSR Performance Stock Award	Dec. 31, 2013 Performance Stock Awards TSR Performance Stock Award Minimum	Dec. 31, 2013 Performance Stock Awards TSR Performance Stock Award Maximum	Dec. 31, 2013 Performance Stock Awards ROC Performance Stock Awards	Dec. 31, 2012 Performance Stock Awards ROC Performance Stock Awards	Dec. 31, 2011 Performance Stock Awards ROC Performance Stock Awards	Dec. 31, 2013 Performance Stock Awards ROC Performance Stock Awards Minimum	Dec. 31, 2013 Performance Stock Awards ROC Performance Stock Awards Maximum	Dec. 31, 2011 Performance Stock Awards Period 2008-2010 TSR Performance Stock Award	Dec. 31, 2012 Performance Stock Awards Period 2009-2011 TSR Performance Stock Award	Dec. 31, 2013 Performance Stock Awards Period 2010-2012 TSR Performance Stock Award	Feb. 28, 2014 Performance Stock Awards Performance stock award granted in 2011 TSR Performance Stock Award	Dec. 31, 2013 Performance Stock Awards Performance stock award granted in 2011 TSR Performance Stock Award
Stock Awards Vesting
Payout Level (as a percent)						0.00%	200.00%				0.00%	200.00%	97.00%	52.00%	0.00%	93.00%
Dividend yield (as a percent)			0.00%	0.00%	0.00%
Expected volatility (as a percent)			37.80%	43.20%	65.40%
Risk-free interest rates (as a percent)			0.34%	0.39%	1.15%
Vesting or performance period		3 years	3 years	3 years	3 years			3 years									3 years
Shares Issued (vested)	94,005								0	0			16,781	8,528		8,376
Expense recognized								$ 0	$ 0	$ 0