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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.

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

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Description of the period of time over 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, which may be expressed in a variety of ways (for example, in years, month and year).

+ References

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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-Publisher FASB

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- Definition

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.

+ References

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

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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 Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended				3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Equity Incentive Plan Restricted Stock [Member]	Dec. 31, 2011 Equity Incentive Plan Restricted Stock [Member]	Mar. 31, 2012 Restricted Stock Awards for Certain Management [Member] Y	Mar. 31, 2012 Restricted Stock Awards for Certain Management [Member] Maximum [Member]	Mar. 31, 2012 Restricted Stock Awards for Certain Management [Member] Minimum [Member]
Stock Plans (Textual) [Abstract]
Weighted-average grant-date fair value of restricted stock awards granted			$ 29.75		$ 39.88
Restricted stock award, outstanding			875,161	633,647
Restricted stock award granted by Company			281,430		104,500
Vesting period					May vest in 2015
Volatility of weighted-average grant date fair value						238.00%	15.00%
Risk-free rate of weighted-average grant date fair value					0.54%
Weighted-average grant date fair value of expected life					3.0
Additional Stock Plans (Textual) [Abstract]
Compensation plan	$ 2.4	$ 2.3