The high end of the range of 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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- Definition

The low end of the range of 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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- Definition

The weighted average fair value at grant date for equity-based awards issued during the period.

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- Definition

Represents the number of sub-tranches into which the options are divided.

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Represents the number of tranches into which the options are divided.

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- Definition

Represents the percentage of options vesting on the first anniversary.

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- Definition

Represents the high end of the range of the share price which limits the right to receive potential cash payments.

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- Definition

Represents the low end of the range of the share price which triggers the right to receive potential cash payments.

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- Definition

Represents the period in which the remainder of the options will vest on a quarterly basis.

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- Definition

Represents the exercise price per share of shares granted per the grant terms.

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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The maximum 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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- Definition

The minimum 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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- Definition

The estimated measure of the maximum 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 estimated measure of the minimum 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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- Definition

The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Gross number of share options (or share units) granted during the period.

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STOCK-BASED COMPENSATION (Details) (USD $)	1 Months Ended	6 Months Ended
STOCK-BASED COMPENSATION (Details) (USD $)	Feb. 28, 2011	Jun. 30, 2011	Feb. 16, 2011
Common Stock Options
Stock-based compensation
Shares granted during the period (in shares)	580,000
Exercise price of shares granted (in dollars per share)			$ 22.32
Number of tranches into which the options are divided		2
Vesting period under Time-based Tranche (in years)		4Y
Percentage of options vesting on the first anniversary under Time-based Tranche (as a percent)		25.00%
Remainder vesting period under Time-based Tranche (in years)		3
Number of sub-tranches into which the options are divided under Performance-based Tranche		4
Assumptions used in the option pricing model to assess the fair values of the options granted and the fair value of equity based incentive awards
Risk free interest rate, low end of range (as a percent)		0.29%
Risk free interest rate, high end of range (as a percent)		2.37%
Expected option life, low end of range (in years)		1.0
Expected option life, high end of range (in years)		5.0
Expected dividend yield, low end of range (as a percent)		2.87%
Expected dividend yield, high end of range (as a percent)		3.49%
Volatility factor, low end of range (as a percent)		73.50%
Volatility factor, high end of range (as a percent)		94.30%
Weighted average grant-date fair value (in dollars per share)		$ 13.14
Common Stock Options \| Performance-based October 2009 grants
Stock-based compensation
Shares granted during the period with approved performance criteria for 2011 (in shares)			512,500
Common Stock Options \| Performance-based December 2009 grants
Stock-based compensation
Shares granted during the period with approved performance criteria for 2011 (in shares)			43,125
Common Stock Options \| Performance-based April 2010 grants
Stock-based compensation
Shares granted during the period with approved performance criteria for 2011 (in shares)			15,000
Common Stock Options \| Performance-based February 2011 grants
Stock-based compensation
Shares granted during the period with approved performance criteria for 2011 (in shares)			72,500
Equity-based incentive awards \| Performance-based October 2009 grants
Stock-based compensation
Right to receive potential cash payments, share price, low end of range (in dollars per share)		$ 14.00
Right to receive potential cash payments, share price, high end of range (in dollars per share)		$ 16.80